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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 4,438 $ 5,450
Gross unrealized gains 91 129
Gross unrealized losses (106) (148)
Total available-for-sale, fair value 4,423 5,431
Other-than-temporary impairments [1] (71) (75)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 26 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 916 876
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 26 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 916 876
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 179 517
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 179 517
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 3 4
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 4 5
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 4,256 4,929
Gross unrealized gains 90 128
Gross unrealized losses (106) (148)
Total available-for-sale, fair value 4,240 4,909
Other-than-temporary impairments [1] (71) (75)
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 916  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,317 909
Gross unrealized gains 34 30
Gross unrealized losses (6) (10)
Total available-for-sale, fair value 1,345 929
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 840 1,382
Gross unrealized gains 29 72
Gross unrealized losses (12) (15)
Total available-for-sale, fair value 857 1,439
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 10 8
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 10 8
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,332 1,352
Gross unrealized gains 25 20
Gross unrealized losses (80) (102)
Total available-for-sale, fair value 1,277 1,270
Other-than-temporary impairments [1] (72) (73)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 365 871
Gross unrealized gains 1 3
Gross unrealized losses (4) (12)
Total available-for-sale, fair value 362 862
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 35 50
Gross unrealized gains 1 1
Gross unrealized losses (4) (6)
Total available-for-sale, fair value 32 45
Other-than-temporary impairments [1] 0 (3)
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 66 41
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 66 41
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 116 22
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 116 22
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 175 294
Gross unrealized gains 0 2
Gross unrealized losses 0 (3)
Total available-for-sale, fair value 175 293
Other-than-temporary impairments [1] $ 1 $ 1
[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.