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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, 2016
Dec. 31, 2015
Available For Sale Securities [Abstract]    
Amortized cost $ 6,070 $ 6,160
Gross unrealized gains 261 132
Gross unrealized losses (100) (172)
Total available-for-sale, fair value 6,231 6,120
Other-than-temporary impairments [1] (81) (89)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 890 2,689
Gross unrealized gains 0 24
Gross unrealized losses (317) (312)
Total Held-To-Maturity, fair value 573 2,401
Other-Than-Temporary Impairments [1] 0 0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 890 2,689
Gross unrealized gains 0 24
Gross unrealized losses (317) (312)
Total Held-To-Maturity, fair value 573 2,401
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 187 351
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 187 351
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 6 12
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 7 13
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 5,877 5,797
Gross unrealized gains 260 131
Gross unrealized losses (100) (172)
Total available-for-sale, fair value 6,037 5,756
Other-than-temporary impairments [1] (81) (89)
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 890  
Total Held-To-Maturity, fair value 573  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,109 947
Gross unrealized gains 63 32
Gross unrealized losses (1) (3)
Total available-for-sale, fair value 1,171 976
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,474 1,674
Gross unrealized gains 117 65
Gross unrealized losses (3) (14)
Total available-for-sale, fair value 1,588 1,725
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 165 197
Gross unrealized gains 3 3
Gross unrealized losses (1) (2)
Total available-for-sale, fair value 167 198
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,707 1,516
Gross unrealized gains 63 21
Gross unrealized losses (81) (103)
Total available-for-sale, fair value 1,689 1,434
Other-than-temporary impairments [1] (78) (85)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 906 995
Gross unrealized gains 12 7
Gross unrealized losses (1) (9)
Total available-for-sale, fair value 917 993
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 49 55
Gross unrealized gains 1 2
Gross unrealized losses (6) (6)
Total available-for-sale, fair value 44 51
Other-than-temporary impairments [1] (3) (4)
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 41 31
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 41 31
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 24 51
Gross unrealized gains 0 0
Gross unrealized losses 0 (18)
Total available-for-sale, fair value 24 33
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 402 331
Gross unrealized gains 1 1
Gross unrealized losses (7) (17)
Total available-for-sale, fair value 396 315
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.