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Stock Plans - Deferred Stock Units, Performance Share Units and Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Beginning balance (in shares) 7,669,705 7,593,627 9,418,216
Shares granted (in shares) 2,283,832 3,470,323 3,312,141
Vested (in shares) [1] (2,511,992) (2,622,807) (3,992,902)
Forfeited (in shares) [1] (882,535) (771,438) (1,143,828)
Ending balance (in shares) 6,559,010 7,669,705 7,593,627
Weighted-Average Fair Value Per Share      
Beginning balance (in dollars per share) [2] $ 39.74 $ 36.90 $ 33.71
Shares granted (in dollars per share) [2] 46.72 42.75 35.65
Vested (in dollars per share) [2] 38.91 35.78 28.15
Forfeited (in dollars per share) [2] 42.00 38.69 37.58
Ending balance (in dollars per share) [2] $ 42.19 $ 39.74 $ 36.90
Weighted-Average Aggregate Fair Value      
Total shares granted [2] $ 107 $ 148 $ 118
Vested [2] 98 94 112
Actual tax benefit realized for the tax deductions from the shares vested $ 3 $ 7 $ 18
Performance share units      
Number of Shares      
Shares granted (in shares) 1,048,770 1,087,010 1,406,500
Weighted-Average Fair Value Per Share      
Shares granted (in dollars per share) [2] $ 51.23 $ 43.14 $ 34.35
Deferred stock units      
Number of Shares      
Shares granted (in shares) 788,310 845,550 1,040,790
Weighted-Average Fair Value Per Share      
Shares granted (in dollars per share) [2] $ 43.51 $ 43.20 $ 39.70
Additional shares granted      
Number of Shares      
Shares granted (in shares) [3] 446,752 1,537,763 864,851
Weighted-Average Fair Value Per Share      
Shares granted (in dollars per share) [2] $ 41.78 $ 42.22 $ 32.90
Annual grant to eligible employees      
Grant Date      
Grant date Feb. 22, 2018 Feb. 16, 2017 Feb. 22, 2016
[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 $3 million in 2018, $7 million in 2017 and $18 million in 2016.
[2]
[3] Includes performance share units and deferred stock units.