Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions	3 Months Ended
	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