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Share Repurchase Program - Additional Information (Detail)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Equity [Abstract]    
Share repurchase program, authorized amount $ 3,000,000,000 $ 3,000,000,000
Common stock repurchased (Treasury stock) | shares 10.9 44.0
Common stock repurchased, average price per share | $ / shares $ 40.98 $ 50.53
Common stock repurchased, aggregate amount $ 444,000,000 $ 2,221,000,000