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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows — operating activities:
Cash used in operating activities	$ 5,453	$ 485	$ (206)
Cash flows — investing activities:
Capital expenditures	(1,676)	(1,301)	(1,033)
Cash used in investing activities	(2,145)	(1,239)	(1,153)
Cash flows — financing activities:
Issuances of preferred stock	0	0	2,000
Stock repurchases	(1,245)	(1,949)	(471)
Dividends paid to common stockholders	(313)	(302)	(290)
Dividends paid to preferred stockholders	(150)	(151)	0
Other, net	83	31	(21)
Cash provided by (used in) financing activities	(294)	(80)	2,274
Cash, cash equivalents and restricted cash — beginning balance	525	1,359	444
Cash, cash equivalents and restricted cash — ending balance	3,539	525	1,359
Parent
Cash flows — operating activities:
Cash used in operating activities	(31)	(27)	(38)
Cash flows — investing activities:
Capital expenditures	0	0	0
Dividend received from subsidiaries	1,625	1,775	405
Equity contribution to subsidiaries	0	0	(988)
Cash used in investing activities	1,625	1,775	(583)
Cash flows — financing activities:
Issuances of preferred stock	0	0	2,000
Stock repurchases	(1,245)	(1,949)	(471)
Dividends paid to common stockholders	(313)	(302)	(290)
Dividends paid to preferred stockholders	(150)	(151)	0
Other, net	91	40	(23)
Cash provided by (used in) financing activities	(1,617)	(2,362)	1,216
Net change in cash, cash equivalents and restricted cash	(23)	(614)	595
Cash, cash equivalents and restricted cash — beginning balance	54	668	73
Cash, cash equivalents and restricted cash — ending balance	$ 31	$ 54	$ 668

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