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Debt (Aggregate Maturity Of Debt Obligations) (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2022 $ 265
2023 0
Thereafter 1,248
Total 1,513
Corporate Obligations [Member]  
Debt Instrument [Line Items]  
2022 265
2023 0
Thereafter 308
Total 573
Surplus Notes Due 2033 [Member]  
Debt Instrument [Line Items]  
2023 0
Thereafter 940
Total $ 940