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Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Earnings Per Share [Abstract] |  |
Income (loss) from continuing operations after income taxes | $ 613 | $ 281
Net income (loss) Attributable to Noncontrolling Interest, Continuing Operations | 3 | 10
Net income (loss) from Continuing Operations Available to Common Shareholders | 610 | 271
Income (loss) from discontinued operations after income taxes | (10) | 1
Net income (loss) Available to Common Stockholders | $ 600 | $ 272

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