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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost $ 23,518 $ 30,085
Allowance for Credit Loss 9  
Net Carrying Amount [1] 23,509  
Gross Unrealized Gains 5,784 7,519
Gross Unrealized Losses 0 10
Fair Value 29,293 37,594
Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 23,518 30,085
Allowance for Credit Loss 9  
Net Carrying Amount 23,509  
Gross Unrealized Gains 5,784 7,519
Gross Unrealized Losses 0 10
Fair Value 29,293 37,594
Japan government and agencies | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 22,531 22,241
Allowance for Credit Loss 3  
Net Carrying Amount 22,528  
Gross Unrealized Gains 5,502 6,050
Gross Unrealized Losses 0 0
Fair Value 28,030 28,291
Municipalities    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 364 821
Fair Value 481 1,083
Municipalities | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 364 821
Allowance for Credit Loss 0  
Net Carrying Amount 364  
Gross Unrealized Gains 117 262
Gross Unrealized Losses 0 0
Fair Value 481 1,083
Mortgage- and asset-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost   16
Fair Value   17
Mortgage- and asset-backed securities | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost   16
Gross Unrealized Gains   1
Gross Unrealized Losses   0
Fair Value   17
Public utilities    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 45 2,535
Fair Value 59 2,954
Public utilities | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 46 2,535
Allowance for Credit Loss 1  
Net Carrying Amount 45  
Gross Unrealized Gains 14 419
Gross Unrealized Losses 0 0
Fair Value 59 2,954
Sovereign and supranational    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 549 1,123
Fair Value 692 1,320
Sovereign and supranational | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 554 1,123
Allowance for Credit Loss 5  
Net Carrying Amount 549  
Gross Unrealized Gains 143 197
Gross Unrealized Losses 0 0
Fair Value 692 1,320
Banks/financial institutions    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost   916
Fair Value   1,018
Banks/financial institutions | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost   916
Gross Unrealized Gains   105
Gross Unrealized Losses   3
Fair Value   1,018
Other corporate    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 23 2,433
Fair Value 31 2,911
Other corporate | Yen-denominated    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held to maturity, fixed maturities, amortized cost 23 2,433
Allowance for Credit Loss 0  
Net Carrying Amount 23  
Gross Unrealized Gains 8 485
Gross Unrealized Losses 0 7
Fair Value $ 31 $ 2,911
[1] Net of allowance for credit losses