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Debt (Aggregate Maturity Of Debt Obligations) (Detail)
$ in Millions
Dec. 31, 2021
USD ($)
Corporate debt [Member]  
Debt Instrument [Line Items]  
2022 $ 0
2023 0
2024 0
2025 46
2026 0
Thereafter 256
Total 302
Surplus Notes due 2033 [Member]  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 0
2025 0
2026 0
Thereafter 940
Total 940
Total debt obligations due [Member]  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 0
2025 46
2026 0
Thereafter 1,196
Total $ 1,242