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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost $ 575 $ 890
Allowance for Credit Losess 0  
Gross unrealized gains 0 2
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 575 892
Other-Than-Temporary Impairments [1]   0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 575 890
Allowance for Credit Losess 0  
Gross unrealized gains 0 2
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 575 892
Other-Than-Temporary Impairments [1]   0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 2,511 2,984
Allowance for Credit Losess 0  
Gross unrealized gains 198 126
Gross unrealized losses (8) (11)
Total available-for-sale, fair value 2,701 3,099
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 918 838
Allowance for Credit Losess 0  
Gross unrealized gains 85 46
Gross unrealized losses 0 (2)
Total available-for-sale, fair value 1,003 882
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 159 178
Allowance for Credit Losess 0  
Gross unrealized gains 31 22
Gross unrealized losses 0 0
Total available-for-sale, fair value 190 200
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 12 8
Allowance for Credit Losess 0  
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 13 9
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 870 1,140
Allowance for Credit Losess 0  
Gross unrealized gains 68 52
Gross unrealized losses (4) (1)
Total available-for-sale, fair value 934 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 281 317
Allowance for Credit Losess 0  
Gross unrealized gains 8 3
Gross unrealized losses 0 0
Total available-for-sale, fair value 289 320
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 23 23
Allowance for Credit Losess 0  
Gross unrealized gains 3 1
Gross unrealized losses 0 (5)
Total available-for-sale, fair value 26 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 [1]   0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 125 139
Allowance for Credit Losess 0  
Gross unrealized gains 0 0
Gross unrealized losses (4) (2)
Total available-for-sale, fair value 121 137
Other-than-temporary impairments [1]   0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 106 321
Allowance for Credit Losess 0  
Gross unrealized gains 1 1
Gross unrealized losses 0 (1)
Total available-for-sale, fair value $ 107 321
Other-than-temporary impairments [1]   $ 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.