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Debt (Aggregate Maturity Of Debt Obligations) (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Corporate Obligations [Member]  
Debt Instrument [Line Items]  
2016 $ 0
2017 0
2018 0
2019 0
2020 0
Thereafter 574
Long-term Debt, Total 574
14% Surplus Notes Due 2033 [Member]  
Debt Instrument [Line Items]  
2016 0 [1]
2017 0 [1]
2018 940 [1]
2019 0 [1]
2020 0 [1]
Thereafter 0 [1]
Long-term Debt, Total 940 [1]
Debt [Member]  
Debt Instrument [Line Items]  
2016 0
2017 0
2018 940
2019 0
2020 0
Thereafter 574
Long-term Debt, Total $ 1,514
[1] Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.