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General - Schedule of Net Income Available to Shareholders (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net (Loss) Income Available to Common Stockholders | $ (637) | $ 518 | $ (943) | $ 1,074
Less: Net Income allocated to restricted stock awards(a) | $ (3) | $ (3) | $ (6) | $ (6)
Basic Weighted Average Common Shares Outstanding | 2,261 | 2,262 | 2,263 | 2,262
Basic (Loss) Earnings Per Common Share | $ (0.28) | $ 0.23 | $ (0.42) | $ 0.47
Class P Common Stock |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net (Loss) Income Available to Common Stockholders | $ (640) | $ 515 | $ (949) | $ 1,068
Unvested restricted stock awards | Class P Common Stock |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Restricted stock awards outstanding | 12 |  | 12 |

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