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Schedule IV - Reinsurance (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]      
Direct Premiums Written $ (28) $ (24) $ (14)
Ceded Premiums Written 31 17 (2)
Assumed Premiums Written 0 0 0
Premiums Written, Net $ (60) $ (41) $ (12)
Percentage of Amount Assumed to Net   0.00% 0.00%