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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, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 27 $ 552 $ 227    
Basic Weighted Average Common Shares Outstanding 2,230 2,230 2,187    
Basic Earnings Per Common Share $ 0.01 $ 0.25 $ 0.10    
Warrants 0 0 6    
Diluted Weighted Average Common Shares Outstanding 2,230 2,230 2,193    
Number of Warrants Expiring       293  
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 40
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 10 8 7    
Warrants to purchase our Class P shares(a)          
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 116 293 291    
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 8 8    
Mandatory convertible preferred stock(b)          
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 58 58 10    
Less: Net Income Allocated to Restricted stock awards(a)          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Net Income Available to Common Stockholders $ (5) $ (4) $ (13)    
Unvested Restricted Stock Awards, Issued and Non Issued 11        
Class P          
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]          
Net Income Available to Common Stockholders $ 22 $ 548 $ 214