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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, 2019
Dec. 31, 2018
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost $ 890 $ 890
Gross unrealized gains 87 35
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 977 925
Other-Than-Temporary Impairments [1] 0 0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 87 35
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 977 925
Other-Than-Temporary Impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 3,008 3,817
Gross unrealized gains 148 131
Gross unrealized losses (43) (167)
Total available-for-sale, fair value 3,113 3,781
Other-than-temporary impairments [1] (33) (26)
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 807 1,093
Gross unrealized gains 59 26
Gross unrealized losses (1) (10)
Total available-for-sale, fair value 865 1,109
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 205 641
Gross unrealized gains 24 97
Gross unrealized losses 0 (11)
Total available-for-sale, fair value 229 727
Other-than-temporary impairments [1] 0 42
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 8 9
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 8 9
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,239 1,473
Gross unrealized gains 58 6
Gross unrealized losses (34) (131)
Total available-for-sale, fair value 1,263 1,348
Other-than-temporary impairments [1] (33) (68)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 297 218
Gross unrealized gains 4 1
Gross unrealized losses (1) (5)
Total available-for-sale, fair value 300 214
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 25 30
Gross unrealized gains 1 1
Gross unrealized losses (5) (4)
Total available-for-sale, fair value 21 27
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 23 53
Gross unrealized gains 1 0
Gross unrealized losses 0 (2)
Total available-for-sale, fair value 24 51
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 129 122
Gross unrealized gains 0 0
Gross unrealized losses (2) (3)
Total available-for-sale, fair value 127 119
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 275 178
Gross unrealized gains 1 0
Gross unrealized losses 0 (1)
Total available-for-sale, fair value 276 177
Other-than-temporary impairments [1] $ 0 $ 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.