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Stock Repurchases (Details) - USD ($)
shares in Millions
3 Months Ended
Feb. 09, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Stockholders' Equity Note [Abstract]        
Stock repurchase program, authorized amount   $ 2,000,000,000   $ 550,000,000
Stock repurchase program, remaining authorized amount   $ 571,000,000    
Accelerated share repurchases, initial price to be paid $ 75,000,000      
Subsequent Event [Line Items]        
Accelerated share repurchases, number of shares 0.4      
Accelerated share repurchases, percentage of shares to be repurchased 85.00%      
Shares repurchased from employees who surrendered shares to satisfy minimum tax withholding obligations   0.1    
Shares repurchased from employees who surrendered shares to satisfy minimum tax withholding obligations, value   $ 13,300,000 $ 16,800,000