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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, 2018
Dec. 31, 2017
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost $ 3,817 $ 4,438
Gross unrealized gains 131 91
Gross unrealized losses (167) (106)
Total available-for-sale, fair value 3,781 4,423
Other-than-temporary impairments [1] (26) (71)
Variable Interest Entity Primary Beneficiary [Member]    
Held To Maturity Securities [Abstract]    
Total held-to-maturity, amortized cost 890 890
Gross unrealized gains 35 26
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 925 916
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 35 26
Gross unrealized losses 0 0
Total held-to-maturity investments, fair value 925 916
Other-Than-Temporary Impairments [1] 0 0
Money Market Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 0 179
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 0 179
Other-than-temporary impairments [1] 0 0
Perpetual Debt And Equity Securities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 0 3
Gross unrealized gains 0 1
Gross unrealized losses 0 0
Total available-for-sale, fair value 0 4
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 3,817 4,256
Gross unrealized gains 131 90
Gross unrealized losses (167) (106)
Total available-for-sale, fair value 3,781 4,240
Other-than-temporary impairments [1] (26) (71)
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 925  
Fixed Maturities [Member] | U S Treasury And Government [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,093 1,317
Gross unrealized gains 26 34
Gross unrealized losses (10) (6)
Total available-for-sale, fair value 1,109 1,345
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 641 840
Gross unrealized gains 97 29
Gross unrealized losses (11) (12)
Total available-for-sale, fair value 727 857
Other-than-temporary impairments [1] 42 0
Fixed Maturities [Member] | Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 9 10
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total available-for-sale, fair value 9 10
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 1,473 1,332
Gross unrealized gains 6 25
Gross unrealized losses (131) (80)
Total available-for-sale, fair value 1,348 1,277
Other-than-temporary impairments [1] (68) (72)
Fixed Maturities [Member] | Residential Mortgage-Backed Agency [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 218 365
Gross unrealized gains 1 1
Gross unrealized losses (5) (4)
Total available-for-sale, fair value 214 362
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 30 35
Gross unrealized gains 1 1
Gross unrealized losses (4) (4)
Total available-for-sale, fair value 27 32
Other-than-temporary impairments [1] 0 0
Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]    
Available For Sale Securities [Abstract]    
Total available-for-sale, amortized cost 53 66
Gross unrealized gains 0 0
Gross unrealized losses (2) 0
Total available-for-sale, fair value 51 66
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 122 116
Gross unrealized gains 0 0
Gross unrealized losses (3) 0
Total available-for-sale, fair value 119 116
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 178 175
Gross unrealized gains 0 0
Gross unrealized losses (1) 0
Total available-for-sale, fair value 177 175
Other-than-temporary impairments [1] $ 0 $ 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.