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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
Jun. 30, 2021
Dec. 31, 2020
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 2,335 $ 2,360
Allowance for Credit Losess 0 0
Gross unrealized gains 146 184
Gross unrealized losses (8) (5)
Total available-for-sale, fair value 2,473 2,539
U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 739 775
Allowance for Credit Losess 0 0
Gross unrealized gains 58 75
Gross unrealized losses (1) (1)
Total available-for-sale, fair value 796 849
US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 156 162
Allowance for Credit Losess 0 0
Gross unrealized gains 29 32
Gross unrealized losses 0 0
Total available-for-sale, fair value 185 194
Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 16 11
Allowance for Credit Losess 0 0
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 17 12
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 864 827
Allowance for Credit Losess 0 0
Gross unrealized gains 43 64
Gross unrealized losses (5) (1)
Total available-for-sale, fair value 902 890
Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 219 305
Allowance for Credit Losess 0 0
Gross unrealized gains 5 8
Gross unrealized losses (1) (1)
Total available-for-sale, fair value 223 312
Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 85 22
Allowance for Credit Losess 0 0
Gross unrealized gains 10 3
Gross unrealized losses 0 0
Total available-for-sale, fair value 95 25
Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 12 17
Allowance for Credit Losess 0 0
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 12 18
Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 118 120
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 117 118
Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 126 121
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value $ 126 $ 121