FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($) $ in Millions	Sep. 30, 2024		Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 7,647		$ 4,530
Assets:
Amortized Cost	17,703		17,824
Fixed maturity securities, held-to-maturity, fair value	18,975		19,657
Commercial mortgage and other loans	11,544		12,527
Commercial mortgage and other loans, fair value	11,315		12,217
Other investments carried at amortized cost	42	[1]	35	[2]
Other investments carried at amortized cost, fair value	42	[1]	35	[2]
Total financial instruments assets not carried at fair value	29,284		30,381
Assets fair value disclosure financial instruments carried at cost	30,332		31,909
Liabilities:
Other policyholders’ funds	6,095		6,169
Other policyholders' funds fair value disclosure	6,015		6,080
Notes payable	7,868		7,240
Notes payable, fair value disclosure	7,643		6,930
Total financial instrument liabilities not carried at fair value	13,963		13,409
Liabilities fair value disclosure financial instruments carried at cost	13,658		13,010
Government and agencies
Assets:
Amortized Cost	16,968		17,083
Fixed maturity securities, held-to-maturity, fair value	18,168		18,829
Municipalities
Assets:
Amortized Cost	262		266
Fixed maturity securities, held-to-maturity, fair value	293		307
Public utilities
Assets:
Amortized Cost	35		34
Fixed maturity securities, held-to-maturity, fair value	37		38
Sovereign and supranational
Assets:
Amortized Cost	415		418
Fixed maturity securities, held-to-maturity, fair value	457		462
Other corporate
Assets:
Amortized Cost	18		18
Fixed maturity securities, held-to-maturity, fair value	20		21
Policy loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	221		214
Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	3,206		2,750
Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	645		227
Level 1
Assets:
Fixed maturity securities, held-to-maturity, fair value	18,007		18,662
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	18,007		18,662
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	18,007		18,662
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	968		995
Commercial mortgage and other loans, fair value	0		0
Other investments carried at amortized cost, fair value	42	[1]	35	[2]
Assets fair value disclosure financial instruments carried at cost	1,010		1,030
Liabilities:
Other policyholders' funds fair value disclosure	0		0
Notes payable, fair value disclosure	6,895		6,178
Liabilities fair value disclosure financial instruments carried at cost	6,895		6,178
Level 2 | Government and agencies
Assets:
Fixed maturity securities, held-to-maturity, fair value	161		167
Level 2 | Municipalities
Assets:
Fixed maturity securities, held-to-maturity, fair value	293		307
Level 2 | Public utilities
Assets:
Fixed maturity securities, held-to-maturity, fair value	37		38
Level 2 | Sovereign and supranational
Assets:
Fixed maturity securities, held-to-maturity, fair value	457		462
Level 2 | Other corporate
Assets:
Fixed maturity securities, held-to-maturity, fair value	20		21
Level 3
Assets:
Fixed maturity securities, held-to-maturity, fair value	0		0
Commercial mortgage and other loans, fair value	11,315		12,217
Other investments carried at amortized cost, fair value	0	[1]	0	[2]
Assets fair value disclosure financial instruments carried at cost	11,315		12,217
Liabilities:
Other policyholders' funds fair value disclosure	6,015		6,080
Notes payable, fair value disclosure	748		752
Liabilities fair value disclosure financial instruments carried at cost	6,763		6,832
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 $221, equity method investments of $3,206, and REO of $645, at carrying value.

[2] Excludes policy loans of $214, equity method investments of $2,750, and REO of $227, at carrying value.