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Balance and Financial Rating Related to Reinsurers (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Protective Life Insurance Company
Dec. 31, 2012
Munich American Reassurance Company
Dec. 31, 2012
Employers Reassurance Corporation
Dec. 31, 2012
General Re Life Corporation
Dec. 31, 2012
All Others
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]              
Reinsurance Recoverables $ 461 $ 436 $ 196 $ 78 $ 64 $ 64 $ 59
A.M. Best Rating     A+ (superior) A+ (superior) A- (excellent) A++ (superior) A+ to B++ (superior to good)