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Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 165 Months Ended
Oct. 21, 2020
Mar. 31, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Apr. 01, 2019
Shares Repurchased [Line Items]                          
BOD authorized                         150,000,000
Stock repurchase program expiration date                 Mar. 31, 2022        
Aggregate cost         $ 1,056       $ 2,956 $ 5,204 $ 40,100    
Shares repurchased     4,045,575 [1] 14,305,793 [2] 9,529,733 [1] 3,732,974 18,149,450 [2]   18,351,368 31,412,157      
Average purchase price [3]     $ 98.87 [1] $ 178.66 [2] $ 163.30 [1] $ 171.24 $ 165.79 [2]   $ 161.07 $ 165.68      
Remaining number of shares that may be repurchased under current authority     114,803,713           114,803,713   114,803,713    
Treasury stock, value     $ 39,680           $ 39,680   $ 39,680 $ 36,424  
Accelerated Share Repurchase Agreement [Member]                          
Shares Repurchased [Line Items]                          
Aggregate cost   $ 2,500           $ 2,000          
Shares repurchased   11,795,930 4,045,575 8,786,380 3,172,900   11,795,930 8,786,380          
Average purchase price                 $ 155.86 $ 167.01      
Subsequent Event [Member]                          
Shares Repurchased [Line Items]                          
Aggregate cost $ 87                        
Shares repurchased 426,000                        
[1] Includes an incremental 4,045,575 and 3,172,900 shares received upon final settlement in July 2020 and August 2019, respectively, under accelerated share repurchase programs.
[2] Includes 8,786,380 and 11,795,930 shares repurchased in February 2020 and 2019, respectively, 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 and 2019 accelerated share repurchase programs was $155.86 and $167.01, respectively.