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Debt (Aggregate Maturity Of Debt Obligations) (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Corporate debt [Member]  
Debt Instrument [Line Items]  
2020 $ 0
2021 0
2022 115
2023 0
2024 0
Thereafter 308
Total 423
Surplus Notes due 2033 [Member]  
Debt Instrument [Line Items]  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 940
Total 940
Total debt obligations due [Member]  
Debt Instrument [Line Items]  
2020 0
2021 0
2022 115
2023 0
2024 0
Thereafter 1,248
Total $ 1,363