INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022		Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 19,063		$ 22,008
Allowance for Credit Losses	7		8
Total fixed maturity securities held to maturity	19,056	[1]	22,000
Gross Unrealized Gains	2,154		4,869
Gross Unrealized Losses	0		0
Fair Value	21,210		26,869
Municipalities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	287		335
Fair Value	335		436
Public utilities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37		43
Fair Value	41		55
Sovereign and supranational
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	446		514
Fair Value	500		650
Other corporate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	19		22
Fair Value	22		29
Yen-denominated
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	19,063		22,008
Allowance for Credit Losses	7		8
Total fixed maturity securities held to maturity	19,056		22,000
Gross Unrealized Gains	2,154		4,869
Gross Unrealized Losses	0		0
Fair Value	21,210		26,869
Yen-denominated | Japan government and agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	18,269		21,089
Allowance for Credit Losses	2		3
Total fixed maturity securities held to maturity	18,267		21,086
Gross Unrealized Gains	2,045		4,613
Gross Unrealized Losses	0		0
Fair Value	20,312		25,699
Yen-denominated | Municipalities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	287		335
Allowance for Credit Losses	0		0
Total fixed maturity securities held to maturity	287		335
Gross Unrealized Gains	48		101
Gross Unrealized Losses	0		0
Fair Value	335		436
Yen-denominated | Public utilities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	38		44
Allowance for Credit Losses	1		1
Total fixed maturity securities held to maturity	37		43
Gross Unrealized Gains	4		12
Gross Unrealized Losses	0		0
Fair Value	41		55
Yen-denominated | Sovereign and supranational
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	450		518
Allowance for Credit Losses	4		4
Total fixed maturity securities held to maturity	446		514
Gross Unrealized Gains	54		136
Gross Unrealized Losses	0		0
Fair Value	500		650
Yen-denominated | Other corporate
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	19		22
Allowance for Credit Losses	0		0
Total fixed maturity securities held to maturity	19		22
Gross Unrealized Gains	3		7
Gross Unrealized Losses	0		0
Fair Value	$ 22		$ 29

[1] Net of allowance for credit losses