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Fair Value and Gross Unrealized Losses for Securities That Have Been in a Continuous Unrealized Loss Position (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value$ 35,395$ 30,654
Total Unrealized Losses5,0393,363
Less than 12 months Fair Value15,63010,582
Less than 12 months Unrealized Losses1,011435
12 months or longer Fair Value19,76520,072
12 months or longer Unrealized Losses4,0282,928
Fixed Maturities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value30,36826,262
Total Unrealized Losses3,9802,798
Less than 12 months Fair Value12,9018,627
Less than 12 months Unrealized Losses780296
12 months or longer Fair Value17,46717,635
12 months or longer Unrealized Losses3,2002,502
Fixed Maturities | Yen Denominated | Japan government and agencies
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value1101,634
Total Unrealized Losses118
Less than 12 months Fair Value241,634
Less than 12 months Unrealized Losses018
12 months or longer Fair Value860
12 months or longer Unrealized Losses10
Fixed Maturities | Yen Denominated | Municipalities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value5959
Total Unrealized Losses62
Less than 12 months Fair Value00
Less than 12 months Unrealized Losses00
12 months or longer Fair Value5959
12 months or longer Unrealized Losses62
Fixed Maturities | Yen Denominated | Mortgage- and asset-backed Securities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value154415
Total Unrealized Losses115
Less than 12 months Fair Value0415
Less than 12 months Unrealized Losses015
12 months or longer Fair Value1540
12 months or longer Unrealized Losses10
Fixed Maturities | Yen Denominated | Public Utilities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value6,2862,877
Total Unrealized Losses585200
Less than 12 months Fair Value3,759766
Less than 12 months Unrealized Losses18547
12 months or longer Fair Value2,5272,111
12 months or longer Unrealized Losses400153
Fixed Maturities | Yen Denominated | Sovereign and Supranational
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value2,8291,579
Total Unrealized Losses22577
Less than 12 months Fair Value1,223428
Less than 12 months Unrealized Losses701
12 months or longer Fair Value1,6061,151
12 months or longer Unrealized Losses15576
Fixed Maturities | Yen Denominated | Banks/financial Institutions
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value11,44510,609
Total Unrealized Losses1,8281,703
Less than 12 months Fair Value2,4911,506
Less than 12 months Unrealized Losses13840
12 months or longer Fair Value8,9549,103
12 months or longer Unrealized Losses1,6901,663
Fixed Maturities | Yen Denominated | Other Corporate
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value7,2184,503
Total Unrealized Losses1,114503
Less than 12 months Fair Value3,833507
Less than 12 months Unrealized Losses27245
12 months or longer Fair Value3,3853,996
12 months or longer Unrealized Losses842458
Fixed Maturities | Dollar Denominated | Municipalities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value32682
Total Unrealized Losses942
Less than 12 months Fair Value0632
Less than 12 months Unrealized Losses028
12 months or longer Fair Value3250
12 months or longer Unrealized Losses914
Fixed Maturities | Dollar Denominated | Mortgage- and asset-backed Securities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value 78
Total Unrealized Losses 13
Less than 12 months Fair Value 20
Less than 12 months Unrealized Losses 0
12 months or longer Fair Value 58
12 months or longer Unrealized Losses 13
Fixed Maturities | Dollar Denominated | Public Utilities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value315556
Total Unrealized Losses2136
Less than 12 months Fair Value264498
Less than 12 months Unrealized Losses1528
12 months or longer Fair Value5158
12 months or longer Unrealized Losses68
Fixed Maturities | Dollar Denominated | Sovereign and Supranational
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value6745
Total Unrealized Losses52
Less than 12 months Fair Value3512
Less than 12 months Unrealized Losses20
12 months or longer Fair Value3233
12 months or longer Unrealized Losses32
Fixed Maturities | Dollar Denominated | Banks/financial Institutions
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value9001,484
Total Unrealized Losses121108
Less than 12 months Fair Value503753
Less than 12 months Unrealized Losses6322
12 months or longer Fair Value397731
12 months or longer Unrealized Losses5886
Fixed Maturities | Dollar Denominated | Other Corporate
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value9531,741
Total Unrealized Losses6479
Less than 12 months Fair Value7691,456
Less than 12 months Unrealized Losses3552
12 months or longer Fair Value184285
12 months or longer Unrealized Losses2927
Perpetual Securities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value5,0174,379
Total Unrealized Losses1,057563
Less than 12 months Fair Value2,7211,942
Less than 12 months Unrealized Losses230138
12 months or longer Fair Value2,2962,437
12 months or longer Unrealized Losses827425
Perpetual Securities | Yen Denominated
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value4,7744,171
Total Unrealized Losses1,014533
Less than 12 months Fair Value2,5571,793
Less than 12 months Unrealized Losses221119
12 months or longer Fair Value2,2172,378
12 months or longer Unrealized Losses793414
Perpetual Securities | Dollar Denominated
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value243208
Total Unrealized Losses4330
Less than 12 months Fair Value164149
Less than 12 months Unrealized Losses919
12 months or longer Fair Value7959
12 months or longer Unrealized Losses3411
Equity Securities
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value1013
Total Unrealized Losses22
Less than 12 months Fair Value813
Less than 12 months Unrealized Losses11
12 months or longer Fair Value20
12 months or longer Unrealized Losses11
Banks/financial Institutions
  
Investments, Unrealized Loss Position [Line Items]  
Total Fair Value17,000 
Total Unrealized Losses$ 3,000