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Restricted Stock, Deferred Stock Unit and Performance Share Unit Activity (Detail)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance | shares 9,418,216
Shares granted | shares 3,071,668
Vested | shares (3,675,455) [1]
Forfeited | shares (297,220) [1]
Ending balance | shares 8,517,209
Weighted-average grant date fair value per share  
Beginning balance | $ / shares $ 28
Shares granted | $ / shares 37.03
Vested | $ / shares 39.95 [1]
Forfeited | $ / shares 35.41 [1]
Ending balance | $ / shares $ 25.84
Weighted-Average Aggregate Fair Value  
Total shares granted | $ $ 114
Vested | $ $ 147
Annual grant to eligible employees  
Grant date  
Grant date Feb. 22, 2016
Performance Share Units  
Number of Shares  
Shares granted | shares 1,406,500
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 39.70
Deferred Stock Units  
Number of Shares  
Shares granted | shares 1,040,790
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 39.70
Additional granted  
Number of Shares  
Shares granted | shares 624,378 [2]
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 26.56 [2]
[1] Includes performance share units, deferred stock units and historically granted restricted stock.
[2] Includes performance share units and deferred stock units.