CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2023	Dec. 31, 2022
ASSETS:
Fixed maturities - available for sale, at fair value (amortized cost: 2023, $16,304; 2022,$13,699, credit allowances: 2023, $(48); 2022, $(46))	$ 15,932,000,000	$ 12,671,000,000
Fixed maturities - held to maturity, at amortized cost (fair value: 2023, $850; 2022, $793 net of credit allowances: 2023, $(8); 2022, $(9))	851,000,000	811,000,000
Equity securities, at 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
Premiums receivable (net of credit allowances: 2023, $(28); 2022, $(21))	2,245,000,000	1,721,000,000
Income tax asset, net	141,000,000	288,000,000
Funds held by reinsureds	306,000,000	303,000,000
Deferred acquisition costs	659,000,000	499,000,000
Prepaid reinsurance premiums	490,000,000	463,000,000
Other assets (net of credit allowances: 2023, $(9); 2022, $(5))	774,000,000	722,000,000
TOTAL ASSETS	31,638,000,000	27,957,000,000
LIABILITIES:
Reserve for losses and loss adjustment expenses	15,796,000,000	14,977,000,000
Unearned premium reserve	3,886,000,000	3,177,000,000
Funds held under reinsurance treaties	54,000,000	43,000,000
Amounts due to reinsurers	488,000,000	436,000,000
Losses in course of payment	139,000,000	77,000,000
Income tax liability, net	29,000,000	0
Senior notes	2,349,000,000	2,347,000,000
Long-term notes	218,000,000	218,000,000
Borrowings from FHLB	819,000,000	519,000,000
Accrued interest on debt and borrowings	22,000,000	19,000,000
Unsettled securities payable	126,000,000	1,000,000
Other liabilities	526,000,000	489,000,000
TOTAL LIABILITIES	24,451,000,000	22,303,000,000
Commitments and Contingencies (Note 11)
STOCKHOLDER'S EQUITY:
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	31,638,000,000	27,957,000,000
Affiliated Entity
ASSETS:
Notes receivable - affiliated	0	840,000,000
Reinsurance recoverables	1,547,000,000	1,935,000,000
Unaffiliated Party
ASSETS:
Reinsurance recoverables	$ 1,816,000,000	$ 1,841,000,000