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Share-Based Compensation - Nonvested Restricted Stock Activity (Details) - Restricted Stock - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Restricted Stock Shares (in thousands)      
Beginning balance (in shares) 4,470 5,748 6,436
Granted (in shares) 1,697 1,994 3,274
Vested (in shares) (2,269) (2,819) (3,509)
Forfeited (in shares) (231) (453) (453)
Ending balance (in shares) 3,667 4,470 5,748
Weighted Average Grant-Date Fair Value per Share      
Weighted average beginning balance (in dollars per share) $ 60.56 $ 52.78 $ 45.86
Granted (in dollars per share) 76.85 67.88 57.61
Vested (in dollars per share) 57.92 50.21 44.64
Forfeited (in dollars per share) 67.66 58.42 52.38
Weighted average ending balance (in dollars per share) $ 69.29 $ 60.56 $ 52.78
Granted (in shares) 1,697 1,994 3,274
Time Based Restricted Units      
Number of Restricted Stock Shares (in thousands)      
Granted (in shares) 997 1,153 2,364
Weighted Average Grant-Date Fair Value per Share      
Granted (in shares) 997 1,153 2,364
Total fair value of restricted stock vested under all restricted stock plans $ 173 $ 206 $ 206