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Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 168 Months Ended
Feb. 04, 2021
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Apr. 01, 2019
Share Repurchase Program [Line Items]                                
BOD authorized                               150,000,000
Stock repurchase program expiration date                       Mar. 31, 2022        
Aggregate cost                       $ 3,705 $ 5,804 $ 8,225 $ 40,900  
Shares repurchased         3,780,743 4,045,575 [1] 14,305,793 [2] 3,582,212 9,529,733 [1] 3,732,974 18,149,450 [2] 22,132,111 34,994,369      
Average purchase price [3]         $ 198.07 $ 98.87 [1] $ 178.66 [2] $ 167.32 $ 163.30 [1] $ 171.24 $ 165.79 [2] $ 167.39 $ 165.85      
Remaining number of shares that may be repurchased under current authority         111,022,970             111,022,970     111,022,970  
Accelerated Share Repurchase Agreement [Member]                                
Share Repurchase Program [Line Items]                                
Aggregate cost   $ 2,000 $ 2,500                          
Shares repurchased   8,786,380 11,795,930 3,172,900   4,045,575 8,786,380   3,172,900   11,795,930          
Average purchase price                       $ 155.86 $ 167.01      
Subsequent Event [Member]                                
Share Repurchase Program [Line Items]                                
Aggregate cost $ 442                              
Shares repurchased 2,100,000                              
[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.