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Shareholders' Equity and Dividend Availability (details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Shareholders' Equity and Dividend Availability disclosure            
Number of authorized shares 1,755.0       1,755.0  
Number of authorized shares, preferred shares 5.0       5.0  
Number of authorized shares, voting common stock 1,745.0       1,745.0  
Number of authorized shares, undesignated shares 5.0       5.0  
Number of shares purchased (in shares) 6.6 4.7 4.9 5.1 21.3  
Cost of shares repurchased $ 750 $ 550 $ 550 $ 550 $ 2,400  
Average price paid per share $ 113.54 $ 117.25 $ 112.12 $ 108.46 $ 112.82  
Remaining capacity under share repurchase authorization $ 934 $ 1,684 $ 2,234 $ 2,784 $ 934  
Cost of shares acquired to cover tax withholding costs and exercise costs         $ 72 $ 74