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Schedule IV - Reinsurance (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Direct Premiums Written $ 2 $ (1) $ (28)
Ceded Premiums Written 35 (1) 31
Assumed Premiums Written 0 0 0
Premiums Written, Net $ (33) $ 0 $ (60)
Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%