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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 25, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net Income Available to Common Stockholders | $ 2,190 | $ 1,481 | $ 27 |
Less: Net Income Allocated to Restricted stock awards | $ (12) | $ (8) | $ (5) |
Basic Weighted Average Common Shares Outstanding | 2,264 | 2,216 | 2,230 |
Basic Earnings Per Common Share | $ 0.96 | $ 0.66 | $ 0.01 |
Warrant exercise price |  |  |  | $ 40
Number of warrants expired |  |  |  | 293
Unvested restricted stock awards |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Antidilutive securities | 13 | 12 | 10 |
Warrants to purchase our Class P shares(a) |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Antidilutive securities | 0 | 0 | 116 |
Convertible trust preferred securities |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Antidilutive securities | 3 | 3 | 3 |
Mandatory convertible preferred stock(b) |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Antidilutive securities | 0 | 48 | 58 |
Class P |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net Income Available to Common Stockholders | $ 2,178 | $ 1,473 | $ 22 |
Class P | Unvested restricted stock awards |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Awards outstanding | 12 |  |  |

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