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INVESTMENTS - Available-for-sale Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 78,935 [1],[2] $ 75,132 [3]
Gross Unrealized Gains 8,386 9,985
Gross Unrealized Losses 1,440 804
Fair Value [4] 85,881 [1],[2] 84,313 [3]
Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value [4] 85,881 84,313
Perpetual securities, amortized cost 1,446 1,462
Perpetual securities, fair value 1,612 1,789
Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 44,538 40,378
Gross Unrealized Gains 5,636 5,582
Gross Unrealized Losses 324 350
Fair Value 49,850 45,610
Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 34,397 34,754
Gross Unrealized Gains 2,750 4,403
Gross Unrealized Losses 1,116 454
Fair Value 36,031 38,703
Japan government and agencies | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 31,384 27,980
Gross Unrealized Gains 3,742 3,363
Gross Unrealized Losses 150 271
Fair Value 34,976 31,072
Municipalities | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,928 1,370
Municipalities | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 375 314
Gross Unrealized Gains 32 28
Gross Unrealized Losses 9 12
Fair Value 398 330
Municipalities | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,396 872
Gross Unrealized Gains 135 168
Gross Unrealized Losses 1 0
Fair Value 1,530 1,040
Mortgage- and asset-backed securities | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 347 444
Mortgage- and asset-backed securities | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 156 242
Gross Unrealized Gains 22 29
Gross Unrealized Losses 0 0
Fair Value 178 271
Mortgage- and asset-backed securities | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 162 161
Gross Unrealized Gains 8 12
Gross Unrealized Losses 1 0
Fair Value 169 173
Public utilities | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 7,364 7,954
Public utilities | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,663 1,635
Gross Unrealized Gains 313 352
Gross Unrealized Losses 3 6
Fair Value 1,973 1,981
Public utilities | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 4,939 5,116
Gross Unrealized Gains 555 884
Gross Unrealized Losses 103 27
Fair Value 5,391 5,973
Sovereign and supranational | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,743 1,909
Sovereign and supranational | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,263 1,380
Gross Unrealized Gains 188 190
Gross Unrealized Losses 30 1
Fair Value 1,421 1,569
Sovereign and supranational | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 264 267
Gross Unrealized Gains 58 73
Gross Unrealized Losses 0 0
Fair Value 322 340
Banks/financial institutions | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 9,182 8,933
Banks/financial institutions | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 5,399 4,742
Gross Unrealized Gains 651 811
Gross Unrealized Losses 126 53
Fair Value 5,924 5,500
Banks/financial institutions | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 2,871 2,808
Gross Unrealized Gains 417 633
Gross Unrealized Losses 30 8
Fair Value 3,258 3,433
Other corporate | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 30,201 32,473
Other corporate | Yen-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 4,298 4,085
Gross Unrealized Gains 688 809
Gross Unrealized Losses 6 7
Fair Value 4,980 4,887
Other corporate | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 24,632 25,384
Gross Unrealized Gains 1,569 2,620
Gross Unrealized Losses 980 418
Fair Value 25,221 27,586
U.S. government and agencies | Dollar-denominated | Fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 133 146
Gross Unrealized Gains 8 13
Gross Unrealized Losses 1 1
Fair Value $ 140 $ 158
[1] Includes perpetual securities ($1,446 at amortized cost and $1,612 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