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Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended 174 Months Ended
Jul. 21, 2021
Jun. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
 [2]
Sep. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Apr. 01, 2019
Shares Repurchased [Line Items]                      
BOD authorized                     150,000,000
Stock repurchase program expiration date             Mar. 31, 2022        
Aggregate cost     $ 3,115       $ 4,517 $ 2,956   $ 45,000  
Shares repurchased     12,204,409 [1] 6,691,421   14,305,793 [2] 18,895,830 14,305,793      
Average purchase price [3]     $ 222.46 [1] $ 209.50   $ 178.66 [2] $ 217.87 $ 178.66      
Remaining number of shares that may be repurchased under current authority   92,127,140 92,127,140       92,127,140     92,127,140  
Treasury stock, value   $ 44,542 $ 44,542       $ 44,542   $ 40,420 $ 44,542  
Accelerated Share Repurchase Agreement [Member]                      
Shares Repurchased [Line Items]                      
Aggregate cost   $ 2,000             $ 2,000    
Shares repurchased   7,209,156 7,209,156   4,045,575 8,786,380     8,786,380    
Average purchase price     $ 221.94         $ 155.86      
Treasury stock, value   $ 1,600 $ 1,600       1,600     1,600  
Paid-in capital, value   $ 400 $ 400       $ 400     $ 400  
Subsequent Event [Member]                      
Shares Repurchased [Line Items]                      
Aggregate cost $ 237                    
Shares repurchased 1,100,000                    
[1] Includes 7,209,156 shares repurchased in May 2021 under accelerated share repurchase programs.
[2] Includes 8,786,380 shares repurchased in February 2020 under accelerated share repurchase programs.
[3] 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. The average price of the initial settlement of the 2021 accelerated share repurchase programs was $221.94.