XML 66 R55.htm IDEA: XBRL DOCUMENT v3.7.0.1
Investments (Amortized Cost And Fair Value Of Available-For-Sale and Held-To-Maturity Investment Portfolios) (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 5,206 $ 5,450
Gross unrealized gains 118 129
Gross unrealized losses (139) (148)
Total available-for-sale securities, fair value 5,185 5,431
Other-than-temporary impairments [1] (64) (75)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 0 0
Gross unrealized losses (11) (14)
Total held-to-maturity investments, fair value 879 876
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 0 0
Gross unrealized losses (11) (14)
Total held-to-maturity investments, fair value 879 876
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 securities, 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 3 4
Gross unrealized gains 1 1
Gross unrealized losses 0 0
Total available-for-sale securities, 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 4,936 4,929
Gross unrealized gains 117 128
Gross unrealized losses (139) (148)
Total available-for-sale securities, fair value 4,914 4,909
Other-than-temporary impairments [1] (64) (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 879  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 865 909
Gross unrealized gains 31 30
Gross unrealized losses (8) (10)
Total available-for-sale securities, fair value 888 929
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 1,364 1,382
Gross unrealized gains 60 72
Gross unrealized losses (20) (15)
Total available-for-sale securities, fair value 1,404 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 1 0
Gross unrealized losses (1) 0
Total available-for-sale securities, 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 1,495 1,352
Gross unrealized gains 20 20
Gross unrealized losses (90) (102)
Total available-for-sale securities, fair value 1,425 1,270
Other-than-temporary impairments [1] (63) (73)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 796 871
Gross unrealized gains 2 3
Gross unrealized losses (13) (12)
Total available-for-sale securities, fair value 785 862
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 59 50
Gross unrealized gains 1 1
Gross unrealized losses (6) (6)
Total available-for-sale securities, fair value 54 45
Other-than-temporary impairments [1] (2) (3)
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 38 41
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale securities, fair value 38 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 52 22
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale securities, fair value 52 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 257 294
Gross unrealized gains 2 2
Gross unrealized losses (1) (3)
Total available-for-sale securities, fair value 258 293
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.