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Deferred Stock Unit, Performance Share Unit, and Restricted Stock Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Beginning balance 9,418,216 10,582,640 11,648,587
Shares granted 3,312,141 3,939,162 4,070,313
Vested [1] (3,992,902) (3,905,745) (4,380,452)
Forfeited [1] (1,143,828) (1,197,841) (755,808)
Ending balance 7,593,627 9,418,216 10,582,640
Weighted-average grant date fair value per share      
Beginning balance $ 28.00 $ 28.56 $ 24.48
Shares granted 37.50 37.61 34.16
Vested [1] 40.22 37.83 22.98
Forfeited [1] 37.49 32.51 28.14
Ending balance $ 24.29 $ 28.00 $ 28.56
Weighted-Average Aggregate Fair Value      
Total shares granted $ 124 $ 148 $ 139
Vested [1] $ 161 $ 148 $ 101
Annual grant to eligible employees      
Grant date      
Grant date Feb. 22, 2016 Feb. 18, 2015 Feb. 19, 2014
Performance Share Units      
Number of Shares      
Shares granted 1,406,500 1,598,290 1,143,620
Weighted-average grant date fair value per share      
Shares granted $ 39.70 $ 36.94 $ 34.97
Restricted Stock      
Number of Shares      
Shares granted   386,910 750,410
Weighted-average grant date fair value per share      
Shares granted   $ 36.94 $ 34.17
Deferred Stock Units      
Number of Shares      
Shares granted 1,040,790 866,640 1,240,820
Weighted-average grant date fair value per share      
Shares granted $ 39.70 $ 36.94 $ 34.17
Additional options issued      
Number of Shares      
Shares granted [2] 864,851 1,087,322 935,463
Weighted-average grant date fair value per share      
Shares granted [2] $ 31.29 $ 39.35 $ 33.15
[1] Includes performance share units, deferred stock units and restricted stock. The actual tax benefit realized for the tax deductions from the shares vested totaled $18 million in 2016, $18 million in 2015 and $20 million in 2014.
[2] Includes performance share units, deferred stock units and restricted stock.