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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, 2016
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance | shares 9,418,216
Shares granted | shares 3,202,461
Vested | shares (3,903,681) [1]
Forfeited | shares (1,019,864) [1]
Ending balance | shares 7,697,132
Weighted-average grant date fair value per share  
Beginning balance | $ / shares $ 28.00
Shares granted | $ / shares 37.30
Vested | $ / shares 40.13 [1]
Forfeited | $ / shares 37.47 [1]
Ending balance | $ / shares $ 24.46
Weighted-Average Aggregate Fair Value  
Total shares granted | $ $ 119
Vested | $ $ 157 [1]
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 shares granted  
Number of Shares  
Shares granted | shares 755,171 [2]
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 29.51 [2]
[1] Includes performance share units, deferred stock units and historically granted restricted stock.
[2] Includes performance share units and deferred stock units.