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Restricted Stock, Deferred Stock Unit and Performance Share Unit Activity (Detail)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance 10,582,640
Shares granted 3,697,649
Vested (3,442,710)
Forfeited (1,160,533)
Ending balance 9,677,046
Weighted-average grant date fair value per share  
Beginning balance | $ / shares $ 28.56
Shares granted | $ / shares 37.05
Vested | $ / shares 37.18
Forfeited | $ / shares 32.17
Ending balance | $ / shares $ 28.31
Weighted-Average Aggregate Fair Value  
Total shares granted | $ $ 137
Vested | $ $ 128
Performance Share Units  
Number of Shares  
Shares granted 1,598,290
Grant date  
Grant date Feb. 18, 2015
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 36.94
Restricted Stock  
Number of Shares  
Shares granted 386,910
Grant date  
Grant date Feb. 18, 2015
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 36.94
Deferred Stock Units  
Number of Shares  
Shares granted 866,640
Grant date  
Grant date Feb. 18, 2015
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 36.94
Additional granted  
Number of Shares  
Shares granted 845,809 [1]
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 37.44 [1]
[1] Includes performance share units, restricted stock and deferred stock units.