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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, 2016
Dec. 31, 2015
Available For Sale Securities [Abstract]    
Amortized cost $ 5,450 $ 6,160
Gross unrealized gains 129 132
Gross unrealized losses (148) (172)
Total available-for-sale, fair value 5,431 6,120
Other-than-temporary impairments [1] (75) (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 (14) (312)
Total Held-To-Maturity, fair value 876 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 (14) (312)
Total Held-To-Maturity, fair value 876 2,401
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 517 351
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 517 351
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 4 12
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 5 13
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 4,929 5,797
Gross unrealized gains 128 131
Gross unrealized losses (148) (172)
Total available-for-sale, fair value 4,909 5,756
Other-than-temporary impairments [1] (75) (89)
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 890  
Total Held-To-Maturity, fair value 876  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 909 947
Gross unrealized gains 30 32
Gross unrealized losses (10) (3)
Total available-for-sale, fair value 929 976
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,382 1,674
Gross unrealized gains 72 65
Gross unrealized losses (15) (14)
Total available-for-sale, fair value 1,439 1,725
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 8 197
Gross unrealized gains 0 3
Gross unrealized losses 0 (2)
Total available-for-sale, fair value 8 198
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,352 1,516
Gross unrealized gains 20 21
Gross unrealized losses (102) (103)
Total available-for-sale, fair value 1,270 1,434
Other-than-temporary impairments [1] (73) (85)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 871 995
Gross unrealized gains 3 7
Gross unrealized losses (12) (9)
Total available-for-sale, fair value 862 993
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 50 55
Gross unrealized gains 1 2
Gross unrealized losses (6) (6)
Total available-for-sale, fair value 45 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 22 51
Gross unrealized gains 0 0
Gross unrealized losses 0 (18)
Total available-for-sale, fair value 22 33
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 294 331
Gross unrealized gains 2 1
Gross unrealized losses (3) (17)
Total available-for-sale, fair value 293 315
Other-than-temporary impairments [1] $ 1 $ 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.