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Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Available For Sale Securities [Abstract]    
Amortized cost $ 6,437 $ 6,509
Gross unrealized gains 147 209
Gross unrealized losses (171) (147)
Total available-for-sale, fair value 6,413 6,571
Other-than-temporary impairments [1] (94) (90)
Held To Maturity Securities [Abstract]    
Amortized cost 2,724 2,757
Gross unrealized gains 47 77
Gross unrealized losses (191) (202)
Total Held-To-Maturity, fair value 2,580 2,632
Other-Than-Temporary Impairments [1] 0 0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 2,724 2,757
Gross unrealized gains 47 77
Gross unrealized losses (191) (202)
Total Held-To-Maturity, fair value 2,580 2,632
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 217 422
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 217 422
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 12 12
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 13 13
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 6,208 6,075
Gross unrealized gains 146 208
Gross unrealized losses (171) (147)
Total available-for-sale, fair value 6,183 6,136
Other-than-temporary impairments [1] (94) (90)
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Amortized cost 2,724  
Total Held-To-Maturity, fair value 2,580  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 784 631
Gross unrealized gains 31 39
Gross unrealized losses (2) (3)
Total available-for-sale, fair value 813 667
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | US States And Political Subdivisions [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,642 1,644
Gross unrealized gains 62 94
Gross unrealized losses (16) (8)
Total available-for-sale, fair value 1,688 1,730
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 300 283
Gross unrealized gains 6 7
Gross unrealized losses (1) 0
Total available-for-sale, fair value 305 290
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,899 1,984
Gross unrealized gains 30 44
Gross unrealized losses (106) (92)
Total available-for-sale, fair value 1,823 1,936
Other-than-temporary impairments [1] (90) (86)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 1,055 1,116
Gross unrealized gains 11 17
Gross unrealized losses (10) (7)
Total available-for-sale, fair value 1,056 1,126
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Residential Mortgage-Backed Non-Agency [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 47 54
Gross unrealized gains 4 3
Gross unrealized losses (4) (4)
Total available-for-sale, fair value 47 53
Other-than-temporary impairments [1] (4) (4)
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 22 19
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 22 20
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Collateralized Debt Obligations [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 87 113
Gross unrealized gains 0 0
Gross unrealized losses (21) (21)
Total available-for-sale, fair value 66 92
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Other Asset-Backed [Member]    
Available For Sale Securities [Abstract]    
Amortized cost 372 231
Gross unrealized gains 2 3
Gross unrealized losses (11) (12)
Total available-for-sale, fair value 363 222
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.