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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net Income Available to Common Stockholders | $ 119 | $ 2,190 | $ 1,481
Less: Net Income Allocated to Restricted stock awards | $ (13) | $ (12) | $ (8)
Basic Weighted Average Common Shares Outstanding | 2,263 | 2,264 | 2,216
Basic Earnings Per Common Share | $ 0.05 | $ 0.96 | $ 0.66
Unvested restricted stock awards |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive securities | 13 | 13 | 12
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(a) |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive securities | 0 | 0 | 48
Class P |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net Income Available to Common Stockholders | $ 106 | $ 2,178 | $ 1,473
Class P | Unvested restricted stock awards |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Awards outstanding | 13 |  |

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