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Debt (Aggregate Maturity Of Debt Obligations) (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Corporate debt [Member]
Debt Instrument [Line Items]
2025	$ 45
2026	0
2027	95
2028	112
2029	0
Thereafter	21
Total	273
Surplus Notes due 2033 [Member]
Debt Instrument [Line Items]
2025	0
2026	0
2027	0
2028	0
2029	0
Thereafter	940
Total	940
Total debt obligations due [Member]
Debt Instrument [Line Items]
2025	45
2026	0
2027	95
2028	112
2029	0
Thereafter	961
Total	$ 1,213

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