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Schedule IV - (Reinsurance) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]      
Direct Amount $ 3 $ (1) $ 37
Ceded to Others 1 1 1
Assumed From Other Companies 0 0 0
Net Amount $ 2 $ (2) $ 36
Percentage of Amount Assumed to Net 0.00% 0.00% 0.00%