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General Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net Income Available to Common Stockholders $ 401 $ 276
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 9 8
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 293 293
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 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
Class P shares    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net Income Available to Common Stockholders $ 399 $ 275
Restricted stock awards(a)    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net Income Available to Common Stockholders $ 2 $ 1
Unvested Restricted Stock Awards, Issued and Non Issued 9