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Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 10 Months Ended 171 Months Ended
Apr. 21, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Apr. 01, 2019
Shares Repurchased [Line Items]              
BOD authorized             150,000,000
Stock repurchase program expiration date   Mar. 31, 2022          
Aggregate cost   $ 1,402   $ 2,956   $ 42,300  
Shares repurchased [1]   6,691,421   14,305,793      
Average purchase price [1],[2]   $ 209.50   $ 178.66      
Remaining number of shares that may be repurchased under current authority   104,331,549       104,331,549  
Treasury stock, value   $ 41,826     $ 40,420 $ 41,826  
Accelerated Share Repurchase Agreement [Member]              
Shares Repurchased [Line Items]              
Aggregate cost         $ 2,000    
Shares repurchased     4,045,575 8,786,380 8,786,380    
Average purchase price       $ 155.86      
Subsequent Event [Member]              
Shares Repurchased [Line Items]              
Aggregate cost $ 237            
Shares repurchased 1,100,000            
[1] Includes 8,786,380 shares repurchased in February 2020 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 completed 2020 accelerated share repurchase programs was $155.86.