SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ (2,007)	$ (2,074)	$ 3,609
Cash Flows from Investing Activities
Cash received from disposition	619	0	0
Net change in collateral on investments, certain derivatives and related settlements	4,052	(260)	(4,070)
Other	(304)	(310)	(48)
Net cash provided by (used in) investing activities	821	(3,334)	(11,646)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities	(100)	(500)	(300)
Issuance of long-term debt, net of issuance costs	346	0	296
Issuance of preferred stock, net of issuance costs	0	0	986
Repurchase of common stock	0	0	(550)
Dividends paid to preferred stockholders	(91)	(82)	0
Dividends paid to common stockholders	(307)	(305)	(310)
Net cash provided by (used in) financing activities	3,622	5,430	8,768
Net increase (decrease) in cash, invested cash and restricted cash	2,436	22	731
Cash, invested cash and restricted cash as of beginning-of-year	3,365	3,343	2,612
Cash, invested cash and restricted cash as of end-of-year	5,801	3,365	3,343
Proceeds from dividends received	929
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	176	398	608
Cash Flows from Investing Activities
Capital contribution to subsidiaries	(27)	(7)	(925)
Cash received from disposition	125	0	0
Net change in collateral on investments, certain derivatives and related settlements	132	69	583
Other	0	45	(5)
Net cash provided by (used in) investing activities	230	107	(347)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities	(100)	(500)	(300)
Issuance of long-term debt, net of issuance costs	346	0	296
Increase (decrease) in loans from subsidiaries, net	28	(84)	(563)
Increase (decrease) in loans to subsidiaries, net	379	(113)	708
Common stock issued for benefit plans	(5)	(7)	(16)
Issuance of preferred stock, net of issuance costs	0	0	986
Repurchase of common stock	0	0	(550)
Dividends paid to preferred stockholders	(91)	(82)	0
Dividends paid to common stockholders	(306)	(305)	(310)
Net cash provided by (used in) financing activities	251	(1,091)	251
Net increase (decrease) in cash, invested cash and restricted cash	657	(586)	512
Cash, invested cash and restricted cash as of beginning-of-year	129	715	203
Cash, invested cash and restricted cash as of end-of-year	786	129	715
Proceeds from dividends received	$ 595	$ 685	$ 797