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Invested Assets - Fair Value and Gross Unrealized Depreciation of Investments in Unrealized Loss Position (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value $ 726 $ 1,430
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 23 65
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 271 676
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 37 79
Investment securities, Continuous unrealized loss position, Fair Value, Total 997 2,106
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 60 144
Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 546 1,199
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 4 20
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 218 477
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 22 53
Investment securities, Continuous unrealized loss position, Fair Value, Total 764 1,676
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 26 73
Equity securities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 180 231
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 19 45
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 53 199
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 15 26
Investment securities, Continuous unrealized loss position, Fair Value, Total 233 430
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 34 71
Tax Exempt [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 70 81
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 1 1
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 98 240
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 18 36
Investment securities, Continuous unrealized loss position, Fair Value, Total 168 321
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 19 37
Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 476 1,118
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 3 19
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 120 237
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 4 17
Investment securities, Continuous unrealized loss position, Fair Value, Total 596 1,355
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 7 36
U.S. government and government agency and authority obligations [Member] | Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 28 19
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation    1
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 37 18
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 1 1
Investment securities, Continuous unrealized loss position, Fair Value, Total 65 37
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 1 2
Corporate bonds [Member] | Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 170 489
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 1 14
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 49 176
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 1 10
Investment securities, Continuous unrealized loss position, Fair Value, Total 219 665
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 2 24
Foreign government and government agency obligations [Member] | Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 244 499
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 1 1
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 12 21
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation    1
Investment securities, Continuous unrealized loss position, Fair Value, Total 256 520
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 1 2
Residential mortgage-backed securities [Member] | Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value    77
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation    2
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 21 22
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation 2 5
Investment securities, Continuous unrealized loss position, Fair Value, Total 21 99
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total 2 7
Commercial mortgage-backed securities [Member] | Taxable [Member] | Fixed maturities [Member]
   
Schedule of Available-For-Sale Securities [Line Items]    
Investment securities, Continuous unrealized loss position, Less than twelve months, Fair Value 34 34
Investment securities, Continuous unrealized loss position, Less than twelve months, Gross Unrealized Depreciation 1 1
Investment securities, Continuous unrealized loss position, Twelve months or longer, Fair Value 1   
Investment securities, Continuous unrealized loss position, Twelve months or longer, Gross Unrealized Depreciation      
Investment securities, Continuous unrealized loss position, Fair Value, Total 35 34
Investment securities, Continuous unrealized loss position, Gross Unrealized Depreciation, Total $ 1 $ 1