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Note 15 - Share Repurchase Programs (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 36 Months Ended
Feb. 18, 2022
May 26, 2021
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Mar. 31, 2022
Apr. 01, 2022
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)     150,000,000     150,000,000  
Treasury Stock, Shares, Acquired (in shares)     11,014,201 [1]   6,691,421 [1] 83,300,000  
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) [1],[2]     $ 249.95   $ 209.50    
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess     $ 3,193   $ 1,402    
Treasury Stock [Member]              
Treasury Stock, Shares, Acquired (in shares)     11,000,000.0   6,700,000    
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess     $ 2,753   $ 1,402    
Additional Paid-in Capital [Member]              
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess     $ 440   $ (0)    
Accelerated Share Repurchase Programs (ASRs) [Member]              
Treasury Stock, Shares, Acquired (in shares) 7,012,232 7,209,156 7,012,232 1,983,859      
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) $ 250.99            
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess $ 2,200 $ 2,000          
Accelerated Share Repurchase Programs (ASRs) [Member] | Treasury Stock [Member]              
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess 1,800            
Accelerated Share Repurchase Programs (ASRs) [Member] | Additional Paid-in Capital [Member]              
Treasury Stock, Value, Acquired, Cost Method, Including Amount Paid in Excess $ 400            
Subsequent Event [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)             100,000,000
[1] Includes 7,012,232 shares repurchased in February 2022 under accelerated share repurchase programs.
[2] 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 initial settlement of the 2022 accelerated share repurchase programs was $250.99.