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Common Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 16, 2019
Jan. 02, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 19, 2017
May 25, 2017
May 24, 2017
Jun. 12, 2015
Dec. 19, 2014
Class of Stock [Line Items]                    
Stock Repurchase Program, Authorized Amount           $ 2,000        
Stock Repurchased During Period, Value     $ 273 $ 250            
Dividends Per Common Share Declared for the Period     $ 0.8 $ 0.5 $ 0.5          
Warrant Repurchase Program, Authorized Amount                 $ 100  
Unexercised Warrants             293,000,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 40    
Class P                    
Class of Stock [Line Items]                    
Dividends Per Common Share Declared for the Period     0.80 0.50 0.50          
Per common share cash dividend paid in the period     $ 0.725 $ 0.50 $ 0.50          
Subsequent Event                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Value   $ 2                
Dividends Per Common Share Declared for the Period $ 0.20                  
Equity distribution agreement [Member] | Class P                    
Class of Stock [Line Items]                    
Value of Stock Available for Sale Under Equity Distribution Agreement                   $ 5,000
Share issued (in shares)     0 0 0          
Common stock                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Shares     15,000,000 14,000,000            
Common stock | Subsequent Event                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Shares   100,000