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Shareholders' Equity (Changes in Capital Stock) (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance, common stock shares (in shares) 1,708.0    
Balance, treasury stock shares (in shares) (850.0)    
Shares purchased for treasury, treasury stock shares (in shares)   (84.4) (197.1)
Balance, common stock shares (in shares) 1,713.0 1,708.0  
Balance, treasury stock shares (in shares) (925.0) (850.0)  
Balance, common stock par value $ 854    
Balance, treasury stock cost (16,633)    
Shares issued to benefit plans and for option exercises 126 $ 355 $ 182
Purchase of common stock for treasury (2,230) (2,448) (4,244)
Other, net (13) 196 [1] $ (28)
Balance, common stock par value 857 854  
Balance, treasury stock cost $ (18,870) $ (16,633)  
Common Stock [Member]      
Balance, common stock shares (in shares) 1,708.0 1,691.0 1,681.0
Shares issued to benefit plans and for option exercises, common stock shares (in shares) 5.0 17.0 10.0
Balance, common stock shares (in shares) 1,713.0 1,708.0 1,691.0
Balance, common stock par value $ 854 $ 846 $ 840
Shares issued to benefit plans and for option exercises 3 8 6
Balance, common stock par value $ 857 $ 854 $ 846
Treasury Stock [Member]      
Balance, treasury stock shares (in shares) (850.0) (765.0) (551.0)
Shares purchased for treasury, treasury stock shares (in shares) (75.0) (84.0) (214.0)
Other, net, treasury stock shares (in shares)   (1.0)  
Balance, treasury stock shares (in shares) (925.0) (850.0) (765.0)
Balance, treasury stock cost $ (16,633) $ (14,152) $ (9,725)
Shares issued to benefit plans and for option exercises   (2) (2)
Purchase of common stock for treasury (2,230) (2,462) (4,409)
Other, net (7) (17) [1] (16)
Balance, treasury stock cost $ (18,870) $ (16,633) $ (14,152)
[1] Adjustment to retained earnings includes the cumulative effect of the accounting change we recorded upon adoption of ASU 2016-09 in 2017 in the amount of $233 million.