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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost   $ 890
Gross unrealized gains   2
Gross unrealized losses   0
Total held-to-maturity investments, fair value $ 0 892
Other-Than-Temporary Impairments   0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost   890
Gross unrealized gains   2
Gross unrealized losses   0
Total held-to-maturity investments, fair value   892
Other-Than-Temporary Impairments   0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 2,360 2,984
Allowance for Credit Losess 0  
Gross unrealized gains 184 126
Gross unrealized losses (5) (11)
Total available-for-sale, fair value 2,539 3,099
Other-than-temporary impairments   0
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 775 838
Allowance for Credit Losess 0  
Gross unrealized gains 75 46
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 849 882
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 162 178
Allowance for Credit Losess 0  
Gross unrealized gains 32 22
Gross unrealized losses 0 0
Total available-for-sale, fair value 194 200
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 11 8
Allowance for Credit Losess 0  
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 12 9
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 827 1,140
Allowance for Credit Losess 0  
Gross unrealized gains 64 52
Gross unrealized losses (1) (1)
Total available-for-sale, fair value 890 1,191
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 305 317
Allowance for Credit Losess 0  
Gross unrealized gains 8 3
Gross unrealized losses (1) 0
Total available-for-sale, fair value 312 320
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 22 23
Allowance for Credit Losess 0  
Gross unrealized gains 3 1
Gross unrealized losses 0 (5)
Total available-for-sale, fair value 25 19
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 17 20
Allowance for Credit Losess 0  
Gross unrealized gains 1 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 18 20
Other-than-temporary impairments   0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 120 139
Allowance for Credit Losess 0  
Gross unrealized gains 0 0
Gross unrealized losses (2) (2)
Total available-for-sale, fair value 118 137
Other-than-temporary impairments   0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 121 321
Allowance for Credit Losess 0  
Gross unrealized gains 0 1
Gross unrealized losses 0 (1)
Total available-for-sale, fair value $ 121 321
Other-than-temporary impairments   $ 0
[1] Represents unrealized gains or losses on OTTI securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.