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Performance Share Unit, Deferred Stock Unit, and Historically Granted Restricted Stock Activity (Detail)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance | shares 7,593,627
Shares granted | shares 2,093,237
Vested | shares (2,284,703) [1]
Forfeited | shares (293,146) [1]
Ending balance | shares 7,109,015
Weighted-average grant date fair value per share  
Beginning balance | $ / shares $ 24.29
Shares granted | $ / shares 42.74
Vested | $ / shares 42.92 [1]
Forfeited | $ / shares 38.49 [1]
Ending balance | $ / shares $ 23.15
Weighted-Average Aggregate Fair Value  
Total shares granted | $ $ 89
Vested | $ $ 98 [1]
Annual grant to eligible employees  
Grant date  
Grant date Feb. 16, 2017
Performance Share Units  
Number of Shares  
Shares granted | shares 1,087,010
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 43.20
Deferred Stock Units  
Number of Shares  
Shares granted | shares 845,550
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 43.20
Additional options issued  
Number of Shares  
Shares granted | shares 160,677 [2]
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 37.15 [2]
[1] Includes performance share units, deferred stock units and historically granted restricted stock. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the shares vested totaled $6 million in the three months ended March 31, 2017.
[2] Includes performance share units and deferred stock units.