| Consolidated Statements Of Income – USD ($) shares in Thousands, $ in Millions | COSTCO Wholesales Corporation | | | | | Consolidated Balance Sheets – USD ($) $ in Millions | 2021 | 2020 | 2019 |
| 2021 | 2020 | 2019 | | | CURRENT ASSETS |
| REVENUE | | | | | | Cash and cash equivalents | $ 11,258 | $ 12,277 | $ 8,384 |
| Total revenue | $ 195,929 | $ 166,761 | $ 152,703 | | | Short-term investments | 917 | 1,028 | $ 1,060 |
| OPERATING EXPENSES | | | | | | Receivables, net | 1,803 | 1,550 | $ 1,535 |
| Merchandise costs | 170,684 | 144,939 | 132,886 | | | Merchandise inventories | 14,215 | 12,242 | $ 11,395 |
| Selling, general and administrative | 18,461 | 16,332 | 14,994 | | | Other current assets | 1,312 | 1,023 | $ 1,111 |
| Preopening expenses | 76 | 55 | 86 | | | Total current assets | 29,505 | 28,120 | $ 23,485 |
| Operating Income | 6,708 | 5,435 | 4,737 | | | OTHER ASSETS |
| OTHER INCOME (EXPENSE) | | | | | | Property and Equipment, net | 23,492 | 21,807 | 20,890 |
| Interest expense | (171) | (160) | (150) | | | Operating lease right-of-use assets | 2,890 | 2,788 | 0 |
| Interest income and other, net | 143 | 92 | 178 | | | Other long-term assets | 3,381 | 2,841 | 1,025 |
| INCOME BEFORE INCOME TAXES | 6,680 | 5,367 | 4,765 | | | TOTAL ASSETS | 59,268 | 55,556 | 45,400 |
| Income Tax Expense | 1,601 | 1,308 | 1,061 | | | CURRENT LIABILITIES |
| Net income including noncontrolling interests | 5,079 | 4,059 | 3,704 | | | Accounts payable | 16,278 | 14,172 | 11,679 |
| Net income attributable to noncontrolling interests | (72) | (57) | (45) | | | Accrued salaries and benefits | 4,090 | 3,605 | 3,176 |
| NET INCOME ATTRIBUTABLE TO COSTCO | $ 5,007 | $ 4,002 | $ 3,659 | | | Accrued member rewards | 1,671 | 1,393 | 1,180 |
| NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO: | | | | | | Deferred membership fees | 2,042 | 1,851 | 1,711 |
| Basic (in dollars per share) | $ 11.30 | $ 9.05 | $ 8.32 | | | Current portion of long-term debt | 799 | 95 | 1,699 |
| Diluted (in dollars per share) | $ 11.27 | $ 9.02 | $ 8.26 | | | Other current liabilities | 4,561 | 3,728 | 3,792 |
| Weighted Average Number of Shares Outstanding, Diluted [Abstract] | | | | | | Total current liabilities | 29,441 | 24,844 | 23,237 |
| Basic (shares) | 443,089 | 442,297 | 439,755 | | | OTHER LIABILITIES |
| Diluted (shares) | 444,346 | 443,901 | 442,923 | | | Long-term debt, excluding current portion | 6,692 | 7,514 | 5,124 |
| Net sales | | | | | | Long-term operating lease liabilities | 2,642 | 2,558 |
| REVENUE | | | | | | Other long-term liabilities | 2,415 | 1,935 | 1455 |
| Total revenue | $ 192,052 | $ 163,220 | $ 149,351 | | | Total liabilities | 41,190 | 36,851 | 29,816 |
| Membership fees | | | | | | EQUITY |
| REVENUE | | | | | | Preferred stock | 0 | 0 | 0 |
| Total revenue | $ 3,877 | $ 3,541 | $ 3,352 | | | Common Stock | 4 | 4 | 4 |
| | | | | | Additional paid-in capital | 7,031 | 6,698 | 6,417 |
| | | | | | Accumulated other comprehensive loss | (1,137) | (1,297) | (1,436) |
| | | | | | Retained earnings | 11,666 | 12,879 | 10,258 |
| | | | | | Total Costco stockholders' equity | 17,564 | 18,284 | 15,243 |
| | | | | | Noncontrolling interests | 514 | 421 | 341 |
| | | | | | Total equity | 18,078 | 18,705 | 15,584 |
| | | | | | TOTAL LIABILITIES AND EQUITY | $ 59,268 | $ 55,556 | $ 45,400 |
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| | | COSTCO WHOLESALE CORPORATION |
| | | DATA FROM STATEMENTS OF INCOME ( in million ) |
| 2021 | 2020 | 2019 | Change % in 2021 | Change in amount 2021 | Change % in 2020 | Change in amount in 2022 |
| Net Sales | $192,052 | $163,220 | $149,351 | 18% | $28,832 | 9% | $13,869 |
| Less merchandise costs | $170,684 | $144,939 | $132,886 | 18% | $25,745 | 9% | $12,053 |
| Gross Profit | $21,368 | $18,281 | $16,465 |
| Gross Profit Margin | 11.13% | 11.20% | 11.02% | -1% | -$0 | 2% | $0 |
| Total Revenue | $195,929 | $166,761 | $152,703 | 17% | $29,168 | 9% | $14,058 |
| Net Profit Margin | 2.6% | 2.4% | 2.4% | 6% | 0.00 | 0% | 0.00 |
| Operating Income | $195,929 | $166,761 | $152,703 | 17% | $29,168 | 9% | $14,058 |
| Interest Expenses | -$171 | -$160 | -$150 | 7% | -$11 | 7% | -$10 |
| Interest Income and other | $143 | $92 | $178 | 55% | $51 | -48% | -$86 |
| Non operating Income | -$28 | -$68 | $28 | -59% | $40 | -343% | -$96 |
| Net Income Before Taxes | $6,680 | $5,367 | $4,765 | 24% | $1,313 | 13% | $602 |
| Net Income | $5,007 | $4,002 | $3,659 | 25% | $1,005 | 9% | $343 |
| Earing per Share | $11.27 | $9.05 | $8.26 | 25% | $2.22 | 10% | $0.79 |
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| Income tax rate | 24% | 24% | 22% | -2% | 0.09 | 9% | 0.02 |
|
| | COSTCO WHOLESALE CORPORATION |
| | DATA FROM BALANCE SHEETS ( in million ) |
| 2021 | 2020 | 2019 | Change % in 2021 | Change in amount 2021 | Change % in 2020 | Change in amount in 2022 |
| Current Assets | $29,505 | $28,120 | $23,485 | 4.9% | $1,385 | 19.7% | $4,635 |
| Total Assets | $59,268 | $55,556 | $45,400 | 6.7% | $3,712 | 22.4% | $10,156 |
| Current Liabilities | $29,441 | $24,844 | $23,237 | 18.5% | $4,597 | 6.9% | $1,607 |
| Total Liabilities | $41,190 | $36,851 | $29,816 | 11.8% | $4,339 | 23.6% | $7,035 |
| Debt to Total Assets Ratio | 0.69 | 0.66 | 0.66 | 4.8% | 0.03 | 1.0% | 0.01 |
| Book Value | $18,078 | $18,705 | $15,584 | -3.4% | -$627.00 | 20.0% | $3,121.00 |
| Current Ratio | 1.00 | 1.13 | 1.01 | -11.5% | -0.13 | 12.0% | $0.12 |
