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Summary of Significant Accounting Policies Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 25, 2017
May 24, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Net Income Available to Common Stockholders $ 1,481 $ 27 $ 552    
Basic Weighted Average Common Shares Outstanding 2,216 2,230 2,230    
Basic Earnings Per Common Share $ 0.66 $ 0.01 $ 0.25    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 40
Number of Warrants Expired       293  
Unvested restricted stock awards          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 12 10 8    
Warrants to purchase our Class P shares          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements   116 293    
Convertible trust preferred securities          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 3 3 8    
Mandatory convertible preferred stock          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 48 58 58    
Unvested restricted stock awards          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Unvested Restricted Stock Awards, Issued and Non Issued 13        
Class P          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Net Income Available to Common Stockholders $ 1,473 $ 22 $ 548    
Participating Securities [Member] | Unvested restricted stock awards          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Net Income Available to Common Stockholders $ (8) $ (5) $ (4)