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Claim and Claim Adjustment Expense Reserves - Impact of Loss Portfolio Transfer on Consolidated Condensed Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Insurance [Abstract]          
Net A&EP adverse development before consideration of LPT   $ 200   $ 200 $ 150
Provision for uncollectible third party reinsurance on A&EP $ 0   $ 0 0 0
Additional amounts ceded under LPT       200 150
Retroactive reinsurance benefit recognized (12)   (4) (94) (75)
Pretax impact of unrecognized deferred retroactive reinsurance benefit $ (12)   $ (4) $ 106 $ 75