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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, 2017
Dec. 31, 2016
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 5,090 $ 5,450
Gross unrealized gains 122 129
Gross unrealized losses (151) (148)
Total available-for-sale, fair value 5,061 5,431
Other-than-temporary impairments [1] (109) (75)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 4 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 894 876
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 4 0
Gross unrealized losses 0 (14)
Total held-to-maturity investments, fair value 894 876
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 391 517
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 391 517
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 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 3 5
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 4,696 4,929
Gross unrealized gains 122 128
Gross unrealized losses (151) (148)
Total available-for-sale, fair value 4,667 4,909
Other-than-temporary impairments [1] (109) (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 894  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 991 909
Gross unrealized gains 35 30
Gross unrealized losses (5) (10)
Total available-for-sale, fair value 1,021 929
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 1,159 1,382
Gross unrealized gains 54 72
Gross unrealized losses (51) (15)
Total available-for-sale, fair value 1,162 1,439
Other-than-temporary impairments [1] (43) 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 0 0
Total available-for-sale, fair value 11 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 1,399 1,352
Gross unrealized gains 27 20
Gross unrealized losses (78) (102)
Total available-for-sale, fair value 1,348 1,270
Other-than-temporary impairments [1] (65) (73)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 735 871
Gross unrealized gains 2 3
Gross unrealized losses (10) (12)
Total available-for-sale, fair value 727 862
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 55 50
Gross unrealized gains 2 1
Gross unrealized losses (6) (6)
Total available-for-sale, fair value 51 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 30 41
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 30 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 48 22
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 48 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 269 294
Gross unrealized gains 1 2
Gross unrealized losses (1) (3)
Total available-for-sale, fair value 269 293
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.