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Schedule IV - Reinsurance (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Direct Premiums Written $ (1) $ (28) $ (24)
Ceded Premiums Written (1) 31 17
Assumed Premiums Written 0 0 0
Premiums Written, Net $ 0 $ (60) $ (41)
Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%