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Performance Share Unit, Deferred Stock Unit, and Historically Granted Restricted Stock Activity (Detail)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance | shares 7,593,627
Shares granted | shares 2,478,561
Vested | shares (2,522,072) [1]
Forfeited | shares (675,920) [1]
Ending balance | shares 6,874,196
Weighted-average grant date fair value per share  
Beginning balance | $ / shares $ 36.90 [2]
Shares granted | $ / shares 41.11 [2]
Vested | $ / shares 33.70 [1],[2]
Forfeited | $ / shares 38.43 [1],[2]
Ending balance | $ / shares $ 39.44 [2]
Weighted-Average Aggregate Fair Value  
Total shares granted | $ $ 102 [2]
Vested | $ $ 84 [1],[2]
Performance Share Units  
Number of Shares  
Shares granted | shares 1,087,010
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 43.14 [2]
Deferred Stock Units  
Number of Shares  
Shares granted | shares 845,550
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 43.20 [2]
Additional shares granted  
Number of Shares  
Shares granted | shares 546,001 [3]
Weighted-average grant date fair value per share  
Shares granted | $ / shares $ 33.81 [2],[3]
Annual grant to eligible employees  
Grant date  
Grant date Feb. 16, 2017
[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 less than $1 million in the three months and $7 million in the nine months ended September 30, 2017.
[2] Prior-year weighted average fair value per share has been revised.
[3] Includes performance share units and deferred stock units.