SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - STATEMENT OF OPERATIONS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Income Statements, Captions [Line Items]
Interest income	$ 89	$ 75	$ 69
Interest expense	(1,309)	(1,054)	(1,198)
Other income (expense), net	131	24	58
Income tax benefit (expense)	(490)	(556)	(99)
Net income	3,618	2,285	1,463
Net income, after tax amount, attributable to parent	$ 3,075	$ 2,139	$ 1,318
Basic earnings per common share (usd per share)	$ 4.81	$ 3.32	$ 2.01
Weighted-average number of shares outstanding (in shares)	630,296	630,318	623,510
Diluted earnings per common share (usd per share)	$ 4.79	$ 3.31	$ 2.01
Weighted-average number of shares outstanding, diluted (in shares)	632,733	632,757	626,073
Parent Company
Condensed Income Statements, Captions [Line Items]
Interest income	$ 31	$ 35	$ 11
Interest expense	(444)	(326)	(576)
Operating expenses	(101)	(92)	(92)
Other income (expense), net	31	(58)	20
Income tax benefit (expense)	134	111	190
Income (loss) from continuing operations, net of tax	(349)	(330)	(447)
Equity in earnings of subsidiaries, net of income taxes	3,423	2,468	1,764
Net income	3,074	2,138	1,317
Preferred dividends	(44)	(44)	(63)
Net income, after tax amount, attributable to parent	$ 3,030	$ 2,094	$ 1,254
Basic earnings per common share (usd per share)	$ 4.81	$ 3.32	$ 2.01
Weighted-average number of shares outstanding (in shares)	630,296	630,318	623,510
Diluted earnings per common share (usd per share)	$ 4.79	$ 3.31	$ 2.01
Weighted-average number of shares outstanding, diluted (in shares)	632,733	632,757	626,073