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Equity Stock Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 37 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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   35.5        
Shares Repurchased and Retired During Period, Value $ 20 $ 94 $ 896        
Weighted Average Market Price of Shares Repurchased and Retired During Period $ 17.21   $ 25.22        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 204   $ 204        
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 [Member]              
Stock Repurchases [Line Items]              
Shares Authorized under Stock Repurchase Program,       $ 175