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Income Tax Level 4 Deferred tax assets (liabilities) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Net of Valuation Allowance [Abstract]    
Tax basis deferred policy acquisition costs $ 79,000,000 $ 60,000,000
Unearned premium reserve and other underwriting related reserves 1,000,000 4,000,000
VOBA and reserves 567,000,000 557,000,000
Net operating loss carryover 102,000,000 166,000,000
Employee benefits 7,000,000 4,000,000
Foreign tax credit carryover 18,000,000 13,000,000
Deferred reinsurance gain 198,000,000 210,000,000
Other 11,000,000 15,000,000
Total deferred tax assets 983,000,000 1,029,000,000
Components of Deferred Tax Liabilities [Abstract]    
Investment related items 145,000,000 150,000,000
Deferred Tax Liabilities, Net 505,000,000 348,000,000
Net deferred tax assets $ 478,000,000 681,000,000
Valuation Allowance, Deferred Tax Asset, Explanation of Change The Company believes it is more likely than not that all deferred tax assets will be fully realized. In assessing the need for a valuation allowance, management considered future taxable temporary difference reversals, future taxable income exclusive of reversing temporary differences and carryovers, taxable income in open carry back years and other tax planning strategies. From time to time, tax planning strategies could include holding a portion of debt securities with market value losses until recovery, making investments which have specific tax characteristics and business considerations such as asset-liability matching.  
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 484,000,000 790,000,000
Net unrealized gain on investments 360,000,000 198,000,000
Commonwealth [Member]    
Deferred Tax Assets, Net of Valuation Allowance [Abstract]    
Net operating loss carryover 363,000,000 353
Expiring within Tax Years 2028 to 2030    
Components of Deferred Tax Liabilities [Abstract]    
Expected Tax Benefit Attributable to Net Operating Losses Domestic Near term $ 121,000,000 $ 437,000,000