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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 |  |

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