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General Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net Income Available to Common Stockholders $ 333 $ 333 $ 609 $ 762
Basic Weighted Average Common Shares Outstanding 2,229 2,175 2,229 2,158
Warrants 0 12 0 11
Diluted Weighted Average Common Shares Outstanding 2,229 2,187 2,229 2,169
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 40   $ 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 8 7 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 293 287 293 288
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 8 9
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        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net Income Available to Common Stockholders $ 332 $ 330 $ 607 $ 756
Basic Weighted Average Common Shares Outstanding 2,229 2,175 2,229 2,158
Restricted stock awards(a)        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net Income Available to Common Stockholders $ 1 $ 3 $ 2 $ 6
Unvested Restricted Stock Awards, Issued and Non Issued 8   8