FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($) $ in Millions	Sep. 30, 2023		Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 5,241		$ 4,070
Assets:
Amortized Cost	16,904		19,063
Fixed maturity securities, held-to-maturity, fair value	18,460		21,210
Commercial mortgage and other loans	12,873		13,496
Commercial mortgage and other loans, fair value	12,432		13,212
Other investments carried at amortized cost	34	[1]	34	[2]
Other investments carried at amortized cost, fair value	34	[1]	34	[2]
Total financial instruments assets not carried at fair value	29,806		32,586
Assets fair value disclosure financial instruments carried at cost	30,926		34,456
Liabilities:
Other policyholders’ funds	5,884		6,643
Other policyholders' funds fair value disclosure	5,795		6,543
Notes payable	6,824		7,295
Notes payable, fair value disclosure	6,268		6,826
Total financial instrument liabilities not carried at fair value	12,708		13,938
Liabilities fair value disclosure financial instruments carried at cost	12,063		13,369
Government and agencies
Assets:
Amortized Cost	16,200		18,267
Fixed maturity securities, held-to-maturity, fair value	17,687		20,312
Municipalities
Assets:
Amortized Cost	253		287
Fixed maturity securities, held-to-maturity, fair value	289		335
Public utilities
Assets:
Amortized Cost	33		37
Fixed maturity securities, held-to-maturity, fair value	36		41
Sovereign and supranational
Assets:
Amortized Cost	396		446
Fixed maturity securities, held-to-maturity, fair value	429		500
Other corporate
Assets:
Amortized Cost	17		19
Fixed maturity securities, held-to-maturity, fair value	19		22
Policy loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	201		214
Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	2,629		2,290
Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	89		0
Level 1
Assets:
Fixed maturity securities, held-to-maturity, fair value	17,530		20,132
Commercial mortgage and other loans, fair value	0		0
Other investments carried at amortized cost, fair value	0	[1]	0	[2]
Assets fair value disclosure financial instruments carried at cost	17,530		20,132
Liabilities:
Other policyholders' funds fair value disclosure	0		0
Notes payable, fair value disclosure	0		0
Liabilities fair value disclosure financial instruments carried at cost	0		0
Level 1 | Government and agencies
Assets:
Fixed maturity securities, held-to-maturity, fair value	17,530		20,132
Level 1 | Municipalities
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 1 | Public utilities
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 1 | Sovereign and supranational
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 1 | Other corporate
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 2
Assets:
Fixed maturity securities, held-to-maturity, fair value	930		1,078
Commercial mortgage and other loans, fair value	0		0
Other investments carried at amortized cost, fair value	34	[1]	34	[2]
Assets fair value disclosure financial instruments carried at cost	964		1,112
Liabilities:
Other policyholders' funds fair value disclosure	0		0
Notes payable, fair value disclosure	5,555		6,024
Liabilities fair value disclosure financial instruments carried at cost	5,555		6,024
Level 2 | Government and agencies
Assets:
Fixed maturity securities, held-to-maturity, fair value	157		180
Level 2 | Municipalities
Assets:
Fixed maturity securities, held-to-maturity, fair value	289		335
Level 2 | Public utilities
Assets:
Fixed maturity securities, held-to-maturity, fair value	36		41
Level 2 | Sovereign and supranational
Assets:
Fixed maturity securities, held-to-maturity, fair value	429		500
Level 2 | Other corporate
Assets:
Fixed maturity securities, held-to-maturity, fair value	19		22
Level 3
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Commercial mortgage and other loans, fair value	12,432		13,212
Other investments carried at amortized cost, fair value	0	[1]	0	[2]
Assets fair value disclosure financial instruments carried at cost	12,432		13,212
Liabilities:
Other policyholders' funds fair value disclosure	5,795		6,543
Notes payable, fair value disclosure	713		802
Liabilities fair value disclosure financial instruments carried at cost	6,508		7,345
Level 3 | Government and agencies
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 3 | Municipalities
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 3 | Public utilities
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 3 | Sovereign and supranational
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Level 3 | Other corporate
Assets:
Fixed maturity securities, held-to-maturity, fair value	$ 0		$ 0

[1] Excludes policy loans of $201, equity method investments of $2,629 and REO of $89, at carrying value

[2] Excludes policy loans of $214 and equity method investments of $2,290, at carrying value