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Debt (Aggregate Maturity Of Debt Obligations) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Corporate Obligations [Member]
  
Debt Instrument [Line Items]  
2014 $ 0
2015 0
2016 0
2017 0
2018 0
Thereafter 584
Long-term Debt, Total 584
14% Surplus Notes Due 2033 [Member]
  
Debt Instrument [Line Items]  
Callable, price 100
2014 0 [1]
2015 0 [1]
2016 0 [1]
2017 0 [1]
2018 940 [1]
Thereafter 0 [1]
Long-term Debt, Total 940 [1]
Debt [Member]
  
Debt Instrument [Line Items]  
2014 0
2015 0
2016 0
2017 0
2018 940
Thereafter 584
Long-term Debt, Total $ 1,524
[1] Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.