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Subsequent Events (Details) - USD ($)
shares in Millions, $ in Millions
2 Months Ended 12 Months Ended
Feb. 25, 2016
Dec. 31, 2013
Subsequent Event [Line Items]    
Shares purchased   $ 378
Subsequent Event    
Subsequent Event [Line Items]    
Amount of shares purchased (in shares) 2.0  
Shares purchased $ 47  
Remaining authorized amount of shares repurchased $ 528