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Restricted Stock, Deferred Stock Unit and Performance Share Unit Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Beginning balance 10,582,640 11,648,587 12,815,911
Shares granted 3,939,162 4,070,313 5,231,437
Vested (3,905,745) (4,380,452) (5,350,073)
Forfeited (1,197,841) (755,808) (1,048,688)
Ending balance 9,418,216 10,582,640 11,648,587
Weighted-average grant date fair value per share      
Beginning balance $ 28.56 $ 24.48 $ 21.55
Shares granted 37.61 34.16 25.63
Vested 37.83 22.98 18.82
Forfeited 32.51 28.14 23.23
Ending balance $ 28.00 $ 28.56 $ 24.48
Weighted-Average Aggregate Fair Value      
Total shares granted $ 148 $ 139 $ 134
Vested $ 148 $ 101 $ 101
Performance Share Units      
Number of Shares      
Shares granted 1,598,290 1,143,620 1,542,600
Weighted-average grant date fair value per share      
Shares granted $ 36.94 $ 34.97 $ 26.24
Restricted Stock      
Number of Shares      
Shares granted 386,910 750,410 949,030
Weighted-average grant date fair value per share      
Shares granted $ 36.94 $ 34.17 $ 27.05
Deferred Stock Units      
Number of Shares      
Shares granted 866,640 1,240,820 1,386,750
Weighted-average grant date fair value per share      
Shares granted $ 36.94 $ 34.17 $ 27.05
Annual grant to eligible employees      
Grant date      
Grant date Feb. 18, 2015 Feb. 19, 2014 Feb. 20, 2013
Additional granted      
Number of Shares      
Shares granted [1] 1,087,322 935,463 1,353,057
Weighted-average grant date fair value per share      
Shares granted [1] $ 39.35 $ 33.15 $ 22.47
[1] Includes performance share units, restricted stock and deferred stock units.