Earnings Per Share Net Income for Earnings Per Share Calculations - Basic and Diluted (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations after income taxes	$ 36	$ (390)	$ 1,667	$ 657
Net income (loss) Attributable to Noncontrolling Interest, Continuing Operations	2	2	8	18
Net income (loss) from Continuing Operations Available to Common Shareholders	34	(392)	1,659	639
Income (loss) from discontinued operations after income taxes	(4)	0	(59)	1
Net income (loss) Available to Common Stockholders	$ 30	$ (392)	$ 1,600	$ 640