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Stock-based Compensation - PRSU And RSU Activity And Related Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Performance-based Restricted Stock Units    
Shares    
Beginning balance (in shares) 2.7 1.7
Granted (in shares) 0.2 1.6
Vested (in shares) (0.1) (0.2)
Forfeited/Terminated (in shares) (0.8) (0.4)
Ending balance (in shares) 2.0 2.7
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 64.13 $ 68.02
Granted (in dollars per share) 51.72 59.64
Vested (in dollars per share) 68.57 59.39
Forfeited/Terminated (in dollars per share) 68.07 65.48
Ending balance (in dollars per share) $ 61.07 $ 64.13
Restricted Stock Units and Deferred Stock Units    
Shares    
Beginning balance (in shares) 0.6 0.4
Granted (in shares) 0.3 0.4
Vested (in shares) (0.1) (0.1)
Forfeited/Terminated (in shares) 0.0 (0.1)
Ending balance (in shares) 0.8 0.6
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 64.94 $ 59.37
Granted (in dollars per share) 61.29 68.08
Vested (in dollars per share) 62.85 54.20
Forfeited/Terminated (in dollars per share) 64.00 64.66
Ending balance (in dollars per share) $ 63.82 $ 64.94
Intrinsic value $ 34.6