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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
Mar. 31, 2021
Dec. 31, 2020
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 2,728 $ 2,360
Allowance for Credit Losess 0 0
Gross unrealized gains 115 184
Gross unrealized losses (28) (5)
Total available-for-sale, fair value 2,815 2,539
U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,006 775
Allowance for Credit Losess 0 0
Gross unrealized gains 47 75
Gross unrealized losses (5) (1)
Total available-for-sale, fair value 1,048 849
US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 160 162
Allowance for Credit Losess 0 0
Gross unrealized gains 25 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 13 11
Allowance for Credit Losess 0 0
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 13 12
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 883 827
Allowance for Credit Losess 0 0
Gross unrealized gains 31 64
Gross unrealized losses (16) (1)
Total available-for-sale, fair value 898 890
Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 285 305
Allowance for Credit Losess 0 0
Gross unrealized gains 7 8
Gross unrealized losses (3) (1)
Total available-for-sale, fair value 289 312
Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 83 22
Allowance for Credit Losess 0 0
Gross unrealized gains 4 3
Gross unrealized losses (3) 0
Total available-for-sale, fair value 84 25
Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 11 17
Allowance for Credit Losess 0 0
Gross unrealized gains 1 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 114 120
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 113 118
Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 173 121
Allowance for Credit Losess 0 0
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value $ 173 $ 121