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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 26,327 | $ 36,214
Total Unrealized Losses | 2,021 | 2,746
Less than 12 months Fair Value | 13,811 | 27,790
Less than 12 months Unrealized Losses | 568 | 1,376
12 months or longer Fair Value | 12,516 | 8,424
12 months or longer Unrealized Losses | 1,453 | 1,370
Fixed Maturities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 24,774 | 34,828
Total Unrealized Losses | 1,764 | 2,519
Less than 12 months Fair Value | 13,401 | 26,985
Less than 12 months Unrealized Losses | 560 | 1,293
12 months or longer Fair Value | 11,373 | 7,843
12 months or longer Unrealized Losses | 1,204 | 1,226
Fixed Maturities | Japan government and agencies | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,014 | 8,869
Total Unrealized Losses | 3 | 34
Less than 12 months Fair Value | 1,009 | 8,869
Less than 12 months Unrealized Losses | 3 | 34
12 months or longer Fair Value | 5 | 0
12 months or longer Unrealized Losses | 0 | 0
Fixed Maturities | Municipalities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 91 | 177
Total Unrealized Losses | 4 | 12
Less than 12 months Fair Value | 70 | 145
Less than 12 months Unrealized Losses | 2 | 8
12 months or longer Fair Value | 21 | 32
12 months or longer Unrealized Losses | 2 | 4
Fixed Maturities | Public Utilities | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,700 | 2,023
Total Unrealized Losses | 102 | 183
Less than 12 months Fair Value | 1,342 | 1,740
Less than 12 months Unrealized Losses | 70 | 143
12 months or longer Fair Value | 358 | 283
12 months or longer Unrealized Losses | 32 | 40
Fixed Maturities | Public Utilities | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,959 | 2,519
Total Unrealized Losses | 131 | 140
Less than 12 months Fair Value | 1,119 | 1,816
Less than 12 months Unrealized Losses | 47 | 54
12 months or longer Fair Value | 840 | 703
12 months or longer Unrealized Losses | 84 | 86
Fixed Maturities | Sovereign and Supranational | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 13 | 12
Total Unrealized Losses | 0 | 1
Less than 12 months Fair Value | 13 | 12
Less than 12 months Unrealized Losses | 0 | 1
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Fixed Maturities | Sovereign and Supranational | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 887 | 1,152
Total Unrealized Losses | 56 | 100
Less than 12 months Fair Value | 358 | 791
Less than 12 months Unrealized Losses | 2 | 34
12 months or longer Fair Value | 529 | 361
12 months or longer Unrealized Losses | 54 | 66
Fixed Maturities | Banks/financial Institutions | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 381 | 547
Total Unrealized Losses | 17 | 33
Less than 12 months Fair Value | 283 | 454
Less than 12 months Unrealized Losses | 11 | 23
12 months or longer Fair Value | 98 | 93
12 months or longer Unrealized Losses | 6 | 10
Fixed Maturities | Banks/financial Institutions | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4,665 | 4,533
Total Unrealized Losses | 513 | 570
Less than 12 months Fair Value | 1,187 | 2,322
Less than 12 months Unrealized Losses | 28 | 107
12 months or longer Fair Value | 3,478 | 2,211
12 months or longer Unrealized Losses | 485 | 463
Fixed Maturities | Other Corporate | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 11,291 | 11,588
Total Unrealized Losses | 725 | 1,170
Less than 12 months Fair Value | 7,334 | 8,504
Less than 12 months Unrealized Losses | 371 | 733
12 months or longer Fair Value | 3,957 | 3,084
12 months or longer Unrealized Losses | 354 | 437
Fixed Maturities | Other Corporate | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,685 | 3,372
Total Unrealized Losses | 211 | 272
Less than 12 months Fair Value | 598 | 2,296
Less than 12 months Unrealized Losses | 24 | 152
12 months or longer Fair Value | 2,087 | 1,076
12 months or longer Unrealized Losses | 187 | 120
Fixed Maturities | US government and agencies | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 88 | 36
Total Unrealized Losses | 2 | 4
Less than 12 months Fair Value | 88 | 36
Less than 12 months Unrealized Losses | 2 | 4
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Perpetual securities: |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,548 | 1,381
Total Unrealized Losses | 256 | 226
Less than 12 months Fair Value | 405 | 800
Less than 12 months Unrealized Losses | 8 | 82
12 months or longer Fair Value | 1,143 | 581
12 months or longer Unrealized Losses | 248 | 144
Perpetual securities: | Dollar Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 63 | 59
Total Unrealized Losses | 6 | 9
Less than 12 months Fair Value | 56 | 52
Less than 12 months Unrealized Losses | 4 | 8
12 months or longer Fair Value | 7 | 7
12 months or longer Unrealized Losses | 2 | 1
Perpetual securities: | Yen Denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,485 | 1,322
Total Unrealized Losses | 250 | 217
Less than 12 months Fair Value | 349 | 748
Less than 12 months Unrealized Losses | 4 | 74
12 months or longer Fair Value | 1,136 | 574
12 months or longer Unrealized Losses | 246 | 143
Equity Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 5 | 5
Total Unrealized Losses | 1 | 1
Less than 12 months Fair Value | 5 | 5
Less than 12 months Unrealized Losses | 0 | 1
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | $ 1 | $ 0

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