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Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |  |  |
Income (loss) from continuing operations after income taxes | $ 1,018 | $ 766 | $ 1,631 | $ 1,047
Net income (loss) Attributable to Noncontrolling Interest, Continuing Operations | 3 | 6 | 6 | 16
Net income (loss) from Continuing Operations Available to Common Shareholders | 1,015 | 760 | 1,625 | 1,031
Income (loss) from discontinued operations after income taxes | (45) | 0 | (55) | 1
Net income (loss) Available to Common Stockholders | $ 970 | $ 760 | $ 1,570 | $ 1,032

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