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Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share [Abstract] |  |  |  |
Income (loss) from continuing operations after income taxes | $ 36 | $ (390) | $ 1,667 | $ 657
Net income (loss) Attributable to Noncontrolling Interest, Continuing Operations | 2 | 2 | 8 | 18
Net income (loss) from Continuing Operations Available to Common Shareholders | 34 | (392) | 1,659 | 639
Income (loss) from discontinued operations after income taxes | (4) | 0 | (59) | 1
Net income (loss) Available to Common Stockholders | $ 30 | $ (392) | $ 1,600 | $ 640

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