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Claim and Claim Adjustment Expense Reserves - Schedule of Impact of Loss Portfolio Transfer on the Consolidated Statement of Operations (Detail) - CNA Financial [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Additional amounts ceded under LPT:    
Net A&EP adverse development before consideration of LPT   $ 113
Provision for uncollectible third-party reinsurance on A&EP   (16)
Total additional amounts ceded under LPT $ 0 97
Retroactive reinsurance benefit recognized (22) (57)
Pretax impact of deferred retroactive reinsurance $ (22) $ 40