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INVESTMENTS - Available-For-Sale Investments in Debt Securities, Perpetual Securities and Equity Securities (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 66,607 $ 59,515
Gross Unrealized Gains 5,415 3,659
Gross Unrealized Losses 1,002 2,136
Fair Value 71,020 61,038
Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 63,549 56,511
Gross Unrealized Gains 5,101 3,468
Gross Unrealized Losses 821 1,909
Fair Value 67,829 58,070
Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,041 2,987
Gross Unrealized Gains 308 186
Gross Unrealized Losses 181 226
Fair Value 3,168 2,947
Equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 17 17
Gross Unrealized Gains 6 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 29,118 25,488
Gross Unrealized Gains 1,727 1,016
Gross Unrealized Losses 311 506
Fair Value 30,534 25,998
Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 34,431 31,023
Gross Unrealized Gains 3,374 2,452
Gross Unrealized Losses 510 1,403
Fair Value 37,295 32,072
Japan government and agencies | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 18,356 14,936
Gross Unrealized Gains 810 431
Gross Unrealized Losses 1 33
Fair Value 19,165 15,334
Municipalities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,159 1,051
Municipalities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 30  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 30  
Municipalities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 1,004 992
Gross Unrealized Gains 128 71
Gross Unrealized Losses 3 12
Fair Value 1,129 1,051
Mortgage- and asset-backed securities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 679 771
Mortgage- and asset-backed securities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 438 558
Gross Unrealized Gains 36 29
Gross Unrealized Losses 0 0
Fair Value 474 587
Mortgage- and asset-backed securities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 185 163
Gross Unrealized Gains 20 21
Gross Unrealized Losses 0 0
Fair Value 205 184
Public Utilities | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 8,166 7,562
Public Utilities | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,160 2,261
Gross Unrealized Gains 132 100
Gross Unrealized Losses 8 18
Fair Value 2,284 2,343
Public Utilities | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5,268 4,931
Gross Unrealized Gains 671 471
Gross Unrealized Losses 57 183
Fair Value 5,882 5,219
Sovereign and supranational | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 1,588 1,523
Sovereign and supranational | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 951 978
Gross Unrealized Gains 165 85
Gross Unrealized Losses 0 28
Fair Value 1,116 1,035
Sovereign and supranational | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 386 404
Gross Unrealized Gains 86 85
Gross Unrealized Losses 0 1
Fair Value 472 488
Banks/financial Institutions | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 7,066 6,509
Banks/financial Institutions | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 2,911 2,738
Banks/financial Institutions | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,070 2,799
Gross Unrealized Gains 286 220
Gross Unrealized Losses 187 242
Fair Value 3,169 2,777
Banks/financial Institutions | Yen-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,684 2,582
Gross Unrealized Gains 229 151
Gross Unrealized Losses 180 217
Fair Value 2,733 2,516
Banks/financial Institutions | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,316 3,318
Gross Unrealized Gains 590 447
Gross Unrealized Losses 9 33
Fair Value 3,897 3,732
Banks/financial Institutions | Dollar-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 140 196
Gross Unrealized Gains 39 35
Gross Unrealized Losses 1 9
Fair Value 178 222
Other Corporate | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 29,123 25,222
Other Corporate | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value 257 209
Other Corporate | Yen-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 4,113 3,956
Gross Unrealized Gains 298 151
Gross Unrealized Losses 115 185
Fair Value 4,296 3,922
Other Corporate | Yen-denominated | Perpetual securities:
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 217 209
Gross Unrealized Gains 40 0
Gross Unrealized Losses 0 0
Fair Value 257 209
Other Corporate | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 23,407 21,123
Gross Unrealized Gains 1,861 1,347
Gross Unrealized Losses 441 1,170
Fair Value 24,827 21,300
U.S. Government and Agencies | Dollar-denominated | Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 865 92
Gross Unrealized Gains 18 10
Gross Unrealized Losses 0 4
Fair Value $ 883 $ 98