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Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Income (loss) from continuing operations after income taxes $ 281 $ (184) [1]
Net income Attributable to Noncontrolling Interest, Continuing Operations 10 8
Net income (loss) from Continuing Operations Available to Common Shareholders 271 (192)
Income from discontinued operations after income taxes 1 360
Income from Discontinued Operations, Attributable to Noncontrolling Interest 0 4
Net Income from Discontinued Operations Available to Common Shareholders 1 356
Net income Available to Common Stockholders $ 272 $ 164
[1]
Period is presented on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.