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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 [Abstract] |  |  |
Net income from continuing operations | $ 3,003 | $ 4,591 | $ 4,558
Less: Net income attributable to noncontrolling interests | 41 | 49 | 45
Preferred stock dividends | 229 | 236 | 236
Preferred stock discount accretion and redemptions | 4 | 4 | 4
Net income from continuing operations attributable to common shareholders | 2,729 | 4,302 | 4,273
Less: Dividends and undistributed earnings allocated to nonvested restricted shares | 13 | 18 | 18
Net income from continuing operations attributable to basic common shareholders | 2,716 | 4,284 | 4,255
Net income from discontinued operations attributable to common shareholders | 4,555 | 827 | 788
Less: Undistributed earnings allocated to nonvested restricted shares | 22 | 3 | 3
Net income from continuing operations attributable to diluted common shareholders | 2,716 | 4,284 | 4,255
Net income from discontinued operations attributable to basic common shareholders | $ 4,533 | $ 824 | $ 785
Basic weighted-average common shares outstanding (in shares) | 427 | 447 | 467
Basic earnings (loss) per common share from continuing operations (in dollars per share) | $ 6.37 | $ 9.59 | $ 9.11
Basic earnings from discontinued operations (dollars per share) | 10.62 | 1.84 | 1.68
Basic earnings per common share (dollars per share) | $ 16.99 | $ 11.43 | $ 10.79
Less: Impact of earnings per share dilution from discontinued operations | $ 2 | $ 10 | $ 9
Net income from discontinued operations attributable to diluted common shareholders | $ 4,531 | $ 814 | $ 776
Dilutive potential common shares |  | 1 | 3
Diluted weighted-average common shares outstanding (in shares) | 427 | 448 | 470
Diluted earnings (loss) per common share from continuing operations (in dollars per share) | $ 6.36 | $ 9.57 | $ 9.06
Diluted earnings from discontinued operations (dollars per share) | 10.60 | 1.82 | 1.65
Diluted earnings per common share (dollars per share) | $ 16.96 | $ 11.39 | $ 10.71

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