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Common Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 17, 2018
Feb. 08, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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     $ 250              
Issuances of common shares         $ 3,870          
Dividends Per Common Share Declared for the Period     $ 0.500 $ 0.500 $ 1.605          
Payments for Repurchase of Warrants         $ 12          
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     0.50 0.50 $ 1.605          
Per common share cash dividend paid in the period     $ 0.50 $ 0.50 $ 1.93          
Subsequent Event [Member]                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Value   $ 250                
Dividends Per Common Share Declared for the Period $ 0.125                  
Equity distribution agreement [Member] | Class P                    
Class of Stock [Line Items]                    
Value of Stock Available for Sale Under Equity Distribution Agreement                   $ 5,000
Stock Sold During the Period, Shares         102,614,508          
Share issued (in shares)         102,614,508          
Issuances of common shares         $ 3,900          
Common stock                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Shares     14,000,000              
Share issued (in shares)         103,000,000          
Issuances of common shares         $ 1          
Common stock | Subsequent Event [Member]                    
Class of Stock [Line Items]                    
Stock Repurchased During Period, Shares   13,000,000