Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 617	$ 563	$ 478
Less: Dividends paid on and earnings allocated to participating securities	(8)	(7)	(6)
Earnings applicable to common stock	$ 609	$ 556	$ 472
Weighted average common shares outstanding	483,603,395	463,865,661	462,605,341
Basic earnings per common share	$ 1.26	$ 1.20	$ 1.02
Earnings applicable to common stock	$ 609	$ 556	$ 472
Potential dilutive common shares	1,530,950	767,058	676,061
Total shares for diluted earnings per common share computation	485,134,345	464,632,719	463,281,402
Diluted earnings per common share and common share equivalents	$ 1.26	$ 1.20	$ 1.02