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Performance Share Unit, Deferred Stock Unit, and Restricted Stock Activity (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Shares      
Beginning balance 7,593,627 9,418,216 10,582,640
Shares granted 3,470,323 3,312,141 3,939,162
Vested [1] (2,622,807) (3,992,902) (3,905,745)
Forfeited [1] (771,438) (1,143,828) (1,197,841)
Ending balance 7,669,705 7,593,627 9,418,216
Weighted-average grant date fair value per share      
Beginning balance [2] $ 36.90 $ 33.71 $ 28.86
Shares granted [2] 42.75 35.65 37.44
Vested [1],[2] 35.78 28.15 24.66
Forfeited [1],[2] 38.69 37.58 32.63
Ending balance [2] $ 39.74 $ 36.90 $ 33.71
Weighted-Average Aggregate Fair Value      
Total shares granted [2] $ 148 $ 118 $ 147
Vested [1],[2] $ 94 $ 112 $ 96
Performance Share Units      
Number of Shares      
Shares granted 1,087,010 1,406,500 1,598,290
Weighted-average grant date fair value per share      
Shares granted [2] $ 43.14 $ 34.35 $ 38.81
Restricted Stock      
Number of Shares      
Shares granted     386,910
Weighted-average grant date fair value per share      
Shares granted [2]     $ 36.94
Deferred Stock Units      
Number of Shares      
Shares granted 845,550 1,040,790 866,640
Weighted-average grant date fair value per share      
Shares granted [2] $ 43.20 $ 39.70 $ 36.94
Additional shares granted      
Number of Shares      
Shares granted 1,537,763 [3] 864,851 [3] 1,087,322 [4]
Weighted-average grant date fair value per share      
Shares granted [2] $ 42.22 [3] $ 32.90 [3] $ 36.00 [4]
Annual grant to eligible employees      
Grant date      
Grant date Feb. 16, 2017 Feb. 22, 2016 Feb. 18, 2015
[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 $7 million in 2017, $18 million in 2016 and $18 million in 2015.
[2] Performance share units reflect grant date fair values. Prior-year weighted average fair value per share has been revised.
[3] Includes performance share units and deferred stock units.
[4] Includes performance share units, deferred stock units and restricted stock.