SCHEDULE II – CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED BALANCE SHEETS (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]
Fixed maturities - available for sale (amortized cost: 2023, $0; 2022, $0)	$ 15,932,000,000	$ 12,671,000,000
Equity securities, fair value	91,000,000	194,000,000
Other invested assets	3,259,000,000	2,754,000,000
Other invested assets, at fair value	1,481,000,000	1,472,000,000
Short-term investments	1,298,000,000	812,000,000
Cash	527,000,000	481,000,000
Total investments and cash	23,439,000,000	19,195,000,000
Accrued investment income	222,000,000	150,000,000
Other assets	774,000,000	722,000,000
TOTAL ASSETS	31,638,000,000	27,957,000,000
Senior notes	2,349,000,000	2,347,000,000
Long-term notes	218,000,000	218,000,000
Accrued interest on debt and borrowings	22,000,000	19,000,000
Due to affiliates	526,000,000	489,000,000
TOTAL LIABILITIES	24,451,000,000	22,303,000,000
Common stock, par value: $0.01; 3,000 shares authorized; 1,000 shares issued and outstanding (2023 and 2022)	0	0
Additional paid-in capital	1,102,000,000	1,102,000,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $(76) at 2023 and $(225) at 2022	(287,000,000)	(848,000,000)
Retained earnings	6,372,000,000	5,400,000,000
Total stockholder's equity	7,187,000,000	5,654,000,000	$ 7,038,000,000
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	31,638,000,000	27,957,000,000
Affiliated Entity
Condensed Financial Statements, Captions [Line Items]
Notes receivable - affiliated	0	840,000,000
Parent Company
Condensed Financial Statements, Captions [Line Items]
Fixed maturities - available for sale (amortized cost: 2023, $0; 2022, $0)	0	0
Equity securities, fair value	18,000,000	12,000,000
Other invested assets	190,000,000	194,000,000
Other invested assets, at fair value	1,481,000,000	1,472,000,000
Short-term investments	139,000,000	30,000,000
Cash	1,000,000	2,000,000
Total investments and cash	1,829,000,000	1,710,000,000
Investment in subsidiaries, at equity in the underlying net assets	7,545,000,000	5,496,000,000
Accrued investment income	6,000,000	12,000,000
Other assets	1,000,000	0
TOTAL ASSETS	9,916,000,000	8,388,000,000
Senior notes	2,349,000,000	2,347,000,000
Long-term notes	218,000,000	218,000,000
Accrued interest on debt and borrowings	18,000,000	17,000,000
Income taxes	142,000,000	144,000,000
TOTAL LIABILITIES	2,729,000,000	2,734,000,000
Common stock, par value: $0.01; 3,000 shares authorized; 1,000 shares issued and outstanding (2023 and 2022)	0	0
Additional paid-in capital	1,102,000,000	1,102,000,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $(76) at 2023 and $(225) at 2022	(287,000,000)	(848,000,000)
Retained earnings	6,372,000,000	5,400,000,000
Total stockholder's equity	7,187,000,000	5,654,000,000
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	9,916,000,000	8,388,000,000
Parent Company | Affiliated Entity
Condensed Financial Statements, Captions [Line Items]
Notes receivable - affiliated	535,000,000	1,170,000,000
Due to affiliates	$ 3,000,000	$ 7,000,000