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INVESTMENTS - Available-For-Sale Investments in Debt Securities, Perpetual Securities and Equity Securities (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 65,118 $ 59,515
Gross Unrealized Gains 6,139 3,659
Gross Unrealized Losses 976 2,136
Fair Value 70,281 61,038
Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 62,283 56,511
Gross Unrealized Gains 5,810 3,468
Gross Unrealized Losses 861 1,909
Fair Value 67,232 58,070
Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,820 2,987
Gross Unrealized Gains 321 186
Gross Unrealized Losses 115 226
Fair Value 3,026 2,947
Equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 15 17
Gross Unrealized Gains 8 5
Gross Unrealized Losses 0 1
Fair Value 23 21
Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 27,714 25,488
Gross Unrealized Gains 2,012 1,016
Gross Unrealized Losses 310 506
Fair Value 29,416 25,998
Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 34,569 31,023
Gross Unrealized Gains 3,798 2,452
Gross Unrealized Losses 551 1,403
Fair Value 37,816 32,072
Japan government and agencies | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 17,567 14,936
Gross Unrealized Gains 985 431
Gross Unrealized Losses 0 33
Fair Value 18,552 15,334
Municipalities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,214 1,051
Municipalities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 83  
Gross Unrealized Gains 1  
Gross Unrealized Losses 0  
Fair Value 84  
Municipalities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 982 992
Gross Unrealized Gains 151 71
Gross Unrealized Losses 3 12
Fair Value 1,130 1,051
Mortgage- and asset-backed securities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 637 771
Mortgage- and asset-backed securities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 397 558
Gross Unrealized Gains 34 29
Gross Unrealized Losses 0 0
Fair Value 431 587
Mortgage- and asset-backed securities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 182 163
Gross Unrealized Gains 24 21
Gross Unrealized Losses 0 0
Fair Value 206 184
Public Utilities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 8,012 7,562
Public Utilities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 1,946 2,261
Gross Unrealized Gains 170 100
Gross Unrealized Losses 6 18
Fair Value 2,110 2,343
Public Utilities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5,209 4,931
Gross Unrealized Gains 753 471
Gross Unrealized Losses 60 183
Fair Value 5,902 5,219
Sovereign and supranational | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,494 1,523
Sovereign and supranational | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 881 978
Gross Unrealized Gains 163 85
Gross Unrealized Losses 0 28
Fair Value 1,044 1,035
Sovereign and supranational | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 356 404
Gross Unrealized Gains 94 85
Gross Unrealized Losses 0 1
Fair Value 450 488
Banks/financial Institutions | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 6,841 6,509
Banks/financial Institutions | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 2,779 2,738
Banks/financial Institutions | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,031 2,799
Gross Unrealized Gains 288 220
Gross Unrealized Losses 197 242
Fair Value 3,122 2,777
Banks/financial Institutions | Yen-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,486 2,582
Gross Unrealized Gains 230 151
Gross Unrealized Losses 114 217
Fair Value 2,602 2,516
Banks/financial Institutions | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,084 3,318
Gross Unrealized Gains 646 447
Gross Unrealized Losses 11 33
Fair Value 3,719 3,732
Banks/financial Institutions | Dollar-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 133 196
Gross Unrealized Gains 45 35
Gross Unrealized Losses 1 9
Fair Value 177 222
Other Corporate | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 29,011 25,222
Other Corporate | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 247 209
Other Corporate | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,809 3,956
Gross Unrealized Gains 371 151
Gross Unrealized Losses 107 185
Fair Value 4,073 3,922
Other Corporate | Yen-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 201 209
Gross Unrealized Gains 46 0
Gross Unrealized Losses 0 0
Fair Value 247 209
Other Corporate | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 23,307 21,123
Gross Unrealized Gains 2,106 1,347
Gross Unrealized Losses 475 1,170
Fair Value 24,938 21,300
U.S. government and agencies | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 1,449 92
Gross Unrealized Gains 24 10
Gross Unrealized Losses 2 4
Fair Value $ 1,471 $ 98