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Restricted Stock, Deferred Stock Unit and Performance Share Unit Activity (Detail) - 6 months ended Jun. 30, 2015 - USD ($)
$ / shares in Units, $ in Millions
Total
Number of Shares  
Beginning balance 10,582,640
Shares granted 3,627,419
Vested (3,286,055)
Forfeited (737,151)
Ending balance 10,186,853
Weighted-average grant date fair value per share  
Beginning balance $ 28.56
Shares granted 36.97
Vested 36.97
Forfeited 31.81
Ending balance $ 28.61
Weighted-Average Aggregate Fair Value  
Total shares granted $ 134
Vested $ 121
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 $ 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 $ 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 $ 36.94
Additional granted  
Number of Shares  
Shares granted [1] 775,579
Weighted-average grant date fair value per share  
Shares granted [1] $ 37.06
[1] Includes performance share units, restricted stock and deferred stock units.