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Note 18 - Share Repurchase Programs (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 180 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 26, 2021 | Feb. 19, 2020 | Feb. 03, 2022 | Sep. 30, 2021 | May 31, 2021 | Jul. 31, 2020 | Feb. 28, 2020 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | [3] | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | [4] | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Apr. 01, 2019
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,291 | $ 3,705 | $ 5,804 | $ 48,200 |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | [1] |  |  |  |  |  |  |  | $ 233.71 | $ 210.31 | [2] | $ 222.46 | $ 209.50 | $ 198.07 | $ 98.87 | [2] | $ 0 | $ 178.66 | $ 218.69 | $ 167.39 |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  | 5,837,551 | 8,604,239 | [2] | 12,204,409 | 6,691,421 | 3,780,743 | 4,045,575 | [2] | 0 | 14,305,793 | 33,337,620 | 22,132,111 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess |  |  |  | $ 590 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchase Programs (ASRs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess |  | $ 2,000 | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 217.56 | $ 155.86 |  |  |
Treasury Stock, Shares, Acquired (in shares) |  | 7,209,156 | 8,786,380 |  | 1,983,859 | 7,209,156 | 4,045,575 | 8,786,380 |  | 1,983,859 |  |  |  |  | 4,045,575 |  |  |  |  |  |  |  |
[1] | In the period of the final settlement, the average price paid under the accelerated share repurchase programs is calculated based on the total program value less the value assigned to the initial delivery of shares. The average price of the completed 2021 and 2020 accelerated share repurchase programs was $217.56 and $155.86, respectively.
[2] | Includes an incremental 1,983,859 and 4,045,575 shares received upon final settlement in September 2021 and July 2020, respectively, under accelerated share repurchase programs.
[3] | Includes 7,209,156 shares repurchased in May 2021 under accelerated share repurchase programs.
[4] | Includes 8,786,380 shares repurchased in February 2020 under accelerated share repurchase programs.

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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