Summary of Significant Accounting Policies (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic earnings per share:
Net income attributable to common shareholders	$ 84	$ 259
Net income available to common shareholders	$ 84	$ 259
Weighted average common shares outstanding (in shares)	381,000,000	379,000,000
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.68
Diluted earnings per share:
Net income attributable to common shareholders	$ 84	$ 259
Net income available to common shareholders	84	259
Net income available to common shareholders and assumed conversions	$ 84	$ 259
Weighted average common shares outstanding (in shares)	381,000,000	379,000,000
Incremental shares from assumed conversions (in shares)	1,000,000	1,000,000
Adjusted weighted average shares - diluted (in shares)	382,000,000	380,000,000
Diluted earnings per share (in dollars per share)	$ 0.22	$ 0.68
Stock Compensation Plan
Diluted earnings per share:
Antidilutive awards excluded from earnings per share (in shares)	6,533,558	11,412,075