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INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 76,252 [1],[2] $ 75,132 [3]
Gross Unrealized Gains 7,591 9,985
Gross Unrealized Losses 1,547 804
Fair Value [4] 82,296 [1],[2] 84,313 [3]
Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 42,762 40,378
Gross Unrealized Gains 4,722 5,582
Gross Unrealized Losses 648 350
Fair Value 46,836 45,610
Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 33,490 34,754
Gross Unrealized Gains 2,869 4,403
Gross Unrealized Losses 899 454
Fair Value 35,460 38,703
Japan government and agencies | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 29,499 27,980
Gross Unrealized Gains 2,955 3,363
Gross Unrealized Losses 426 271
Fair Value 32,028 31,072
Municipalities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,834 1,370
Municipalities | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 376 314
Gross Unrealized Gains 25 28
Gross Unrealized Losses 17 12
Fair Value 384 330
Municipalities | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,339 872
Gross Unrealized Gains 123 168
Gross Unrealized Losses 12 0
Fair Value 1,450 1,040
Mortgage- and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 333 444
Mortgage- and asset-backed securities | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 151 242
Gross Unrealized Gains 21 29
Gross Unrealized Losses 0 0
Fair Value 172 271
Mortgage- and asset-backed securities | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 154 161
Gross Unrealized Gains 8 12
Gross Unrealized Losses 1 0
Fair Value 161 173
Public utilities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 7,313 7,954
Public utilities | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,685 1,635
Gross Unrealized Gains 303 352
Gross Unrealized Losses 9 6
Fair Value 1,979 1,981
Public utilities | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 4,863 5,116
Gross Unrealized Gains 562 884
Gross Unrealized Losses 91 27
Fair Value 5,334 5,973
Sovereign and supranational    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,557 1,909
Sovereign and supranational | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,116 1,380
Gross Unrealized Gains 133 190
Gross Unrealized Losses 1 1
Fair Value 1,248 1,569
Sovereign and supranational | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 248 267
Gross Unrealized Gains 61 73
Gross Unrealized Losses 0 0
Fair Value 309 340
Banks/financial institutions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 8,939 8,933
Banks/financial institutions | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 5,317 4,742
Gross Unrealized Gains 602 811
Gross Unrealized Losses 159 53
Fair Value 5,760 5,500
Banks/financial institutions | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 2,767 2,808
Gross Unrealized Gains 431 633
Gross Unrealized Losses 19 8
Fair Value 3,179 3,433
Other corporate    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 30,150 32,473
Other corporate | Yen-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 4,618 4,085
Gross Unrealized Gains 683 809
Gross Unrealized Losses 36 7
Fair Value 5,265 4,887
Other corporate | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 23,983 25,384
Gross Unrealized Gains 1,677 2,620
Gross Unrealized Losses 775 418
Fair Value 24,885 27,586
U.S. government and agencies | Dollar-denominated    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 136 146
Gross Unrealized Gains 7 13
Gross Unrealized Losses 1 1
Fair Value 142 158
Fixed maturity securities    
Debt Securities, Available-for-sale [Line Items]    
Perpetual securities, amortized cost 1,408 1,462
Perpetual securities, fair value $ 1,591 $ 1,789
[1] Includes perpetual securities ($1,408 at amortized cost and $1,591 at fair value)
[2] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)
[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)
[4] Includes perpetual securities