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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, 2013 | Dec. 31, 2012
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 26,588 | $ 40,707
Total Unrealized Losses | 2,683 | 1,582
Less than 12 months Fair Value | 19,156 | 28,268
Less than 12 months Unrealized Losses | 1,199 | 368
12 months or longer Fair Value | 7,432 | 12,439
12 months or longer Unrealized Losses | 1,484 | 1,214
Banks/financial Institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,700 |
Total Unrealized Losses | 1,500 |
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 24,524 | 39,250
Total Unrealized Losses | 2,085 | 1,411
Less than 12 months Fair Value | 17,807 | 28,145
Less than 12 months Unrealized Losses | 874 | 368
12 months or longer Fair Value | 6,717 | 11,105
12 months or longer Unrealized Losses | 1,211 | 1,043
Fixed Maturities | Japan government and agencies | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 5 | 17,342
Total Unrealized Losses | 0 | 148
Less than 12 months Fair Value | 5 | 17,342
Less than 12 months Unrealized Losses | 0 | 148
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Fixed Maturities | Municipalities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 34 | 34
Total Unrealized Losses | 6 | 6
Less than 12 months Fair Value | 0 | 1
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 34 | 33
12 months or longer Unrealized Losses | 6 | 6
Fixed Maturities | Municipalities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 56
Total Unrealized Losses |  | 2
Less than 12 months Fair Value |  | 56
Less than 12 months Unrealized Losses |  | 2
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Fixed Maturities | Mortgage- and asset-backed Securities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 9 | 10
Total Unrealized Losses | 0 | 0
Less than 12 months Fair Value | 9 | 10
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Fixed Maturities | Mortgage- and asset-backed Securities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 125 | 136
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 | 125 | 136
12 months or longer Unrealized Losses | 1 | 1
Fixed Maturities | Public Utilities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,154 | 736
Total Unrealized Losses | 31 | 17
Less than 12 months Fair Value | 1,144 | 736
Less than 12 months Unrealized Losses | 31 | 17
12 months or longer Fair Value | 10 | 0
12 months or longer Unrealized Losses | 0 | 0
Fixed Maturities | Public Utilities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,052 | 3,920
Total Unrealized Losses | 275 | 178
Less than 12 months Fair Value | 1,779 | 1,339
Less than 12 months Unrealized Losses | 120 | 31
12 months or longer Fair Value | 1,273 | 2,581
12 months or longer Unrealized Losses | 155 | 147
Fixed Maturities | Sovereign and Supranational | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 33 | 31
Total Unrealized Losses | 2 | 2
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 33 | 31
12 months or longer Unrealized Losses | 2 | 2
Fixed Maturities | Sovereign and Supranational | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 903 | 1,244
Total Unrealized Losses | 107 | 84
Less than 12 months Fair Value | 515 | 507
Less than 12 months Unrealized Losses | 17 | 13
12 months or longer Fair Value | 388 | 737
12 months or longer Unrealized Losses | 90 | 71
Fixed Maturities | Banks/financial Institutions | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 347 | 276
Total Unrealized Losses | 8 | 6
Less than 12 months Fair Value | 318 | 180
Less than 12 months Unrealized Losses | 7 | 3
12 months or longer Fair Value | 29 | 96
12 months or longer Unrealized Losses | 1 | 3
Fixed Maturities | Banks/financial Institutions | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 6,537 | 6,918
Total Unrealized Losses | 926 | 611
Less than 12 months Fair Value | 3,178 | 1,935
Less than 12 months Unrealized Losses | 171 | 28
12 months or longer Fair Value | 3,359 | 4,983
12 months or longer Unrealized Losses | 755 | 583
Fixed Maturities | Other Corporate | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 7,478 | 4,534
Total Unrealized Losses | 271 | 95
Less than 12 months Fair Value | 7,350 | 4,404
Less than 12 months Unrealized Losses | 263 | 86
12 months or longer Fair Value | 128 | 130
12 months or longer Unrealized Losses | 8 | 9
Fixed Maturities | Other Corporate | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4,847 | 4,013
Total Unrealized Losses | 458 | 261
Less than 12 months Fair Value | 3,509 | 1,635
Less than 12 months Unrealized Losses | 265 | 40
12 months or longer Fair Value | 1,338 | 2,378
12 months or longer Unrealized Losses | 193 | 221
Perpetual Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,063 | 1,451
Total Unrealized Losses | 598 | 170
Less than 12 months Fair Value | 1,349 | 120
Less than 12 months Unrealized Losses | 325 | 0
12 months or longer Fair Value | 714 | 1,331
12 months or longer Unrealized Losses | 273 | 170
Perpetual Securities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 18 | 136
Total Unrealized Losses | 6 | 9
Less than 12 months Fair Value | 0 | 120
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 18 | 16
12 months or longer Unrealized Losses | 6 | 9
Perpetual Securities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,045 | 1,315
Total Unrealized Losses | 592 | 161
Less than 12 months Fair Value | 1,349 | 0
Less than 12 months Unrealized Losses | 325 | 0
12 months or longer Fair Value | 696 | 1,315
12 months or longer Unrealized Losses | 267 | 161
Equity Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1 | 6
Total Unrealized Losses | 0 | 1
Less than 12 months Fair Value | 0 | 3
Less than 12 months Unrealized Losses | 0 | 0
12 months or longer Fair Value | 1 | 3
12 months or longer Unrealized Losses | $ 0 | $ 1

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