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Equity Stock Repurchases - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Feb. 22, 2019
Feb. 26, 2018
Feb. 23, 2017
Feb. 24, 2016
Stock Repurchases [Line Items]          
Shares Repurchased and Retired During Period, Shares 1.2        
Shares Repurchased and Retired During Period, Value $ 20        
Weighted Average Market Price of Shares Repurchased and Retired During Period $ 17.21        
Maximum | 2016 Stock Repurchase Plan          
Stock Repurchases [Line Items]          
Shares Authorized under Stock Repurchase Program,         $ 275
Maximum | 2017 Stock Repurchase Plan          
Stock Repurchases [Line Items]          
Shares Authorized under Stock Repurchase Program,       $ 300  
Maximum | 2018 Stock Repurchase Plan          
Stock Repurchases [Line Items]          
Shares Authorized under Stock Repurchase Program,     $ 350    
Maximum | 2019 Stock Repurchase Plan          
Stock Repurchases [Line Items]          
Shares Authorized under Stock Repurchase Program,   $ 175