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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - Fixed Maturities [Member] - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 2,279 $ 2,360
Allowance for Credit Losess 0 0
Gross unrealized gains 134 184
Gross unrealized losses (9) (5)
Total available-for-sale, fair value 2,404 2,539
U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 720 775
Allowance for Credit Losess 0 0
Gross unrealized gains 54 75
Gross unrealized losses (2) (1)
Total available-for-sale, fair value 772 849
US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 151 162
Allowance for Credit Losess 0 0
Gross unrealized gains 27 32
Gross unrealized losses 0 0
Total available-for-sale, fair value 178 194
Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 10 11
Allowance for Credit Losess 0 0
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 10 12
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 901 827
Allowance for Credit Losess 0 0
Gross unrealized gains 38 64
Gross unrealized losses (5) (1)
Total available-for-sale, fair value 934 890
Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 195 305
Allowance for Credit Losess 0 0
Gross unrealized gains 4 8
Gross unrealized losses (1) (1)
Total available-for-sale, fair value 198 312
Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 82 22
Allowance for Credit Losess 0 0
Gross unrealized gains 10 3
Gross unrealized losses 0 0
Total available-for-sale, fair value 92 25
Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 10 17
Allowance for Credit Losess 0 0
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 11 18
Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 119 120
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 118 118
Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 91 121
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value $ 91 $ 121