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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 3,734 $ 3,817
Gross unrealized gains 126 131
Gross unrealized losses (84) (167)
Total available-for-sale, fair value 3,776 3,781
Other-than-temporary impairments [1] 13 (26)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 58 35
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 948 925
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 58 35
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 948 925
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 0 0
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 0 0
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 0 0
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 0 0
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 3,734 3,817
Gross unrealized gains 126 131
Gross unrealized losses (84) (167)
Total available-for-sale, fair value 3,776 3,781
Other-than-temporary impairments [1] 13 (26)
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890  
Total held-to-maturity investments, fair value 948  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 927 1,093
Gross unrealized gains 33 26
Gross unrealized losses (5) (10)
Total available-for-sale, fair value 955 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 509 641
Gross unrealized gains 77 97
Gross unrealized losses (4) (11)
Total available-for-sale, fair value 582 727
Other-than-temporary impairments [1] 54 42
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 13 9
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 13 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 1,673 1,473
Gross unrealized gains 14 6
Gross unrealized losses (63) (131)
Total available-for-sale, fair value 1,624 1,348
Other-than-temporary impairments [1] (41) (68)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 223 218
Gross unrealized gains 1 1
Gross unrealized losses (3) (5)
Total available-for-sale, fair value 221 214
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 29 30
Gross unrealized gains 1 1
Gross unrealized losses (5) (4)
Total available-for-sale, fair value 25 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 54 53
Gross unrealized gains 0 0
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 53 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 113 122
Gross unrealized gains 0 0
Gross unrealized losses (3) (3)
Total available-for-sale, fair value 110 119
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 193 178
Gross unrealized gains 0 0
Gross unrealized losses 0 (1)
Total available-for-sale, fair value 193 177
Other-than-temporary impairments [1] $ 0 $ 0
[1]
Represents unrealized gains or losses on other than temporarily impaired 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.