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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 30,615 | $ 29,310
Total Unrealized Losses | 2,696 | 3,536
Less than 12 months Fair Value | 11,157 | 10,115
Less than 12 months Unrealized Losses | 321 | 523
12 months or longer Fair Value | 19,458 | 19,195
12 months or longer Unrealized Losses | 2,375 | 3,013
Banks/financial Institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 12,000 |
Total Unrealized Losses | 1,500 |
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 28,459 | 26,795
Total Unrealized Losses | 2,378 | 2,902
Less than 12 months Fair Value | 10,476 | 9,370
Less than 12 months Unrealized Losses | 279 | 449
12 months or longer Fair Value | 17,983 | 17,425
12 months or longer Unrealized Losses | 2,099 | 2,453
Fixed Maturities | Japan government and agencies | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,674 | 940
Total Unrealized Losses | 3 | 1
Less than 12 months Fair Value | 3,597 | 859
Less than 12 months Unrealized Losses | 2 | 1
12 months or longer Fair Value | 77 | 81
12 months or longer Unrealized Losses | 1 | 0
Fixed Maturities | Municipalities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 60 | 54
Total Unrealized Losses | 8 | 8
Less than 12 months Fair Value | 29 | 22
Less than 12 months Unrealized Losses | 1 | 1
12 months or longer Fair Value | 31 | 32
12 months or longer Unrealized Losses | 7 | 7
Fixed Maturities | Municipalities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 58 | 60
Total Unrealized Losses | 3 | 4
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 58 | 60
12 months or longer Unrealized Losses | 3 | 4
Fixed Maturities | Mortgage- and asset-backed Securities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 143 | 151
Total Unrealized Losses | 1 | 1
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 143 | 151
12 months or longer Unrealized Losses | 1 | 1
Fixed Maturities | Public Utilities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 439 | 295
Total Unrealized Losses | 25 | 27
Less than 12 months Fair Value | 284 | 110
Less than 12 months Unrealized Losses | 11 | 3
12 months or longer Fair Value | 155 | 185
12 months or longer Unrealized Losses | 14 | 24
Fixed Maturities | Public Utilities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4,779 | 4,995
Total Unrealized Losses | 377 | 392
Less than 12 months Fair Value | 2,094 | 2,404
Less than 12 months Unrealized Losses | 131 | 141
12 months or longer Fair Value | 2,685 | 2,591
12 months or longer Unrealized Losses | 246 | 251
Fixed Maturities | Sovereign and Supranational | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 68 | 66
Total Unrealized Losses | 4 | 5
Less than 12 months Fair Value | 17 | 34
Less than 12 months Unrealized Losses | 0 | 2
12 months or longer Fair Value | 51 | 32
12 months or longer Unrealized Losses | 4 | 3
Fixed Maturities | Sovereign and Supranational | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,589 | 2,349
Total Unrealized Losses | 185 | 199
Less than 12 months Fair Value | 592 | 749
Less than 12 months Unrealized Losses | 17 | 62
12 months or longer Fair Value | 1,997 | 1,600
12 months or longer Unrealized Losses | 168 | 137
Fixed Maturities | Banks/financial Institutions | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 593 | 770
Total Unrealized Losses | 45 | 121
Less than 12 months Fair Value | 219 | 391
Less than 12 months Unrealized Losses | 9 | 56
12 months or longer Fair Value | 374 | 379
12 months or longer Unrealized Losses | 36 | 65
Fixed Maturities | Banks/financial Institutions | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 9,247 | 10,175
Total Unrealized Losses | 1,142 | 1,438
Less than 12 months Fair Value | 926 | 1,639
Less than 12 months Unrealized Losses | 11 | 46
12 months or longer Fair Value | 8,321 | 8,536
12 months or longer Unrealized Losses | 1,131 | 1,392
Fixed Maturities | Other Corporate | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,286 | 834
Total Unrealized Losses | 52 | 62
Less than 12 months Fair Value | 1,112 | 639
Less than 12 months Unrealized Losses | 28 | 27
12 months or longer Fair Value | 174 | 195
12 months or longer Unrealized Losses | 24 | 35
Fixed Maturities | Other Corporate | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 5,523 | 6,106
Total Unrealized Losses | 533 | 644
Less than 12 months Fair Value | 1,606 | 2,523
Less than 12 months Unrealized Losses | 69 | 110
12 months or longer Fair Value | 3,917 | 3,583
12 months or longer Unrealized Losses | 464 | 534
Perpetual Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,152 | 2,507
Total Unrealized Losses | 318 | 633
Less than 12 months Fair Value | 679 | 739
Less than 12 months Unrealized Losses | 42 | 73
12 months or longer Fair Value | 1,473 | 1,768
12 months or longer Unrealized Losses | 276 | 560
Perpetual Securities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 116 | 217
Total Unrealized Losses | 17 | 29
Less than 12 months Fair Value | 60 | 109
Less than 12 months Unrealized Losses | 0 | 4
12 months or longer Fair Value | 56 | 108
12 months or longer Unrealized Losses | 17 | 25
Perpetual Securities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,036 | 2,290
Total Unrealized Losses | 301 | 604
Less than 12 months Fair Value | 619 | 630
Less than 12 months Unrealized Losses | 42 | 69
12 months or longer Fair Value | 1,417 | 1,660
12 months or longer Unrealized Losses | 259 | 535
Equity Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4 | 8
Total Unrealized Losses | 0 | 1
Less than 12 months Fair Value | 2 | 6
Less than 12 months Unrealized Losses | 0 | 1
12 months or longer Fair Value | 2 | 2
12 months or longer Unrealized Losses | $ 0 | $ 0

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