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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ 0 $ 0 97
Retroactive reinsurance benefit recognized (14) (15) (36) (72)
Pretax impact of deferred retroactive reinsurance $ (14) $ (15) $ (36) $ 25