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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.