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Share Repurchase Programs and Dividends - Share Repurchase Programs (Detail)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended 27 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase programs, authorized amount $ 9,000,000,000 $ 9,000,000,000 $ 9,000,000,000
Stock repurchase programs, remaining authorized amount $ 555,000,000 $ 555,000,000 $ 555,000,000
Common Stock [Member]      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchased (in shares) | shares 18.2 107.7 216.2
Aggregate stock repurchase price $ 616,000,000 $ 3,900,000,000 $ 8,400,000,000
Average cost per share (in dollars per share) | $ / shares $ 33.87 $ 35.87 $ 39.06