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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, 2017
Dec. 31, 2016
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 4,774 $ 5,450
Gross unrealized gains 131 129
Gross unrealized losses (98) (148)
Total available-for-sale, fair value 4,807 5,431
Other-than-temporary impairments [1] (63) (75)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 7 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 897 876
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 7 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 897 876
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 267 517
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 267 517
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 4 4
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 5 5
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 4,503 4,929
Gross unrealized gains 130 128
Gross unrealized losses (98) (148)
Total available-for-sale, fair value 4,535 4,909
Other-than-temporary impairments [1] (63) (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 897  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 785 909
Gross unrealized gains 32 30
Gross unrealized losses (5) (10)
Total available-for-sale, fair value 812 929
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 1,054 1,382
Gross unrealized gains 65 72
Gross unrealized losses (6) (15)
Total available-for-sale, fair value 1,113 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 8 8
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 8 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 1,489 1,352
Gross unrealized gains 28 20
Gross unrealized losses (75) (102)
Total available-for-sale, fair value 1,442 1,270
Other-than-temporary impairments [1] (64) (73)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 699 871
Gross unrealized gains 2 3
Gross unrealized losses (8) (12)
Total available-for-sale, fair value 693 862
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 38 50
Gross unrealized gains 2 1
Gross unrealized losses (4) (6)
Total available-for-sale, fair value 36 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 49 41
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 49 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 70 22
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 70 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 311 294
Gross unrealized gains 1 2
Gross unrealized losses 0 (3)
Total available-for-sale, fair value 312 293
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.