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Equity Stock Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 40 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 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 $ 106 $ 20 $ 200 $ 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                  
Stock Repurchases [Line Items]                  
Shares Authorized under Stock Repurchase Program,           $ 175