VARIABLE INTEREST ENTITIES (Details) - USD ($)		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020	Dec. 31, 2020
Assets:
Bonds available for sale	[1]	$ 263,012,000,000			$ 271,496,000,000
Other bond securities	[1]	4,973,000,000			5,291,000,000
Equity securities	[1]	1,160,000,000			1,056,000,000
Mortgage and other loans receivable	[1]	45,468,000,000			45,562,000,000
Other invested assets	[1]	19,390,000,000			19,060,000,000
Short-term investments	[1]	14,454,000,000			18,203,000,000
Accrued investment income	[1]	2,309,000,000			2,271,000,000
Cash		2,796,000,000	[1]	$ 2,738,000,000	2,827,000,000	[1]
Other	[1]	13,223,000,000			13,122,000,000
Total assets		584,390,000,000			586,481,000,000
Liabilities:
Long-term debt	[1]	26,432,000,000			28,103,000,000
Total liabilities		520,830,000,000			519,282,000,000
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Repayment of debt		1,515,000,000		363,000,000
Debt of consolidated investments
Liabilities:
Long-term debt	[1]	9,216,000,000			9,431,000,000
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Repayment of debt		900,000,000		$ 521,000,000
Alternative investments
Assets:
Other invested assets		9,589,000,000			9,572,000,000
Investment real estate
Assets:
Other invested assets		8,172,000,000			7,930,000,000
Real Estate and Investment Entities
Liabilities:
Off-balance sheet exposure		2,200,000,000			2,400,000,000
Real Estate and Investment Entities | External
Liabilities:
Off-balance sheet exposure		600,000,000			700,000,000
Consolidated VIE
Assets:
Bonds available for sale		5,728,000,000			6,089,000,000
Other bond securities		2,226,000,000			2,367,000,000
Equity securities		558,000,000			507,000,000
Mortgage and other loans receivable		2,422,000,000			3,135,000,000
Short-term investments		1,265,000,000			1,926,000,000
Accrued investment income		33,000,000			38,000,000
Cash		378,000,000			332,000,000
Other assets		430,000,000			529,000,000
Other		28,000,000			5,000,000
Total assets		23,111,000,000			24,553,000,000
Liabilities:
Long-term debt		8,592,000,000			8,809,000,000
Other liabilities		773,000,000			564,000,000
Total liabilities		9,365,000,000			9,373,000,000
Consolidated VIE | Alternative investments
Assets:
Other invested assets		2,860,000,000			2,689,000,000
Consolidated VIE | Investment real estate
Assets:
Other invested assets		7,183,000,000			6,936,000,000
Consolidated VIE | Real Estate and Investment Entities
Assets:
Bonds available for sale		0			0
Other bond securities		0			0
Equity securities		558,000,000			507,000,000
Mortgage and other loans receivable		0			0
Short-term investments		174,000,000			365,000,000
Accrued investment income		0			0
Cash		129,000,000			129,000,000
Other assets		129,000,000			166,000,000
Other		26,000,000			3,000,000
Total assets		7,180,000,000			7,237,000,000
Liabilities:
Long-term debt		2,529,000,000			2,559,000,000
Other liabilities		169,000,000			180,000,000
Total liabilities		2,698,000,000			2,739,000,000
Consolidated VIE | Real Estate and Investment Entities | Alternative investments
Assets:
Other invested assets		2,860,000,000			2,689,000,000
Consolidated VIE | Real Estate and Investment Entities | Investment real estate
Assets:
Other invested assets		3,304,000,000			3,378,000,000
Consolidated VIE | Securitization Vehicles
Assets:
Bonds available for sale		5,728,000,000			6,089,000,000
Other bond securities		2,226,000,000			2,367,000,000
Equity securities		0			0
Mortgage and other loans receivable		2,422,000,000			3,135,000,000
Short-term investments		1,071,000,000			1,534,000,000
Accrued investment income		33,000,000			38,000,000
Cash		0			0
Other assets		41,000,000			120,000,000
Other		0			0
Total assets		11,521,000,000			13,283,000,000
Liabilities:
Long-term debt		3,548,000,000			3,961,000,000
Other liabilities		397,000,000			187,000,000
Total liabilities		3,945,000,000			4,148,000,000
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Total assets contributed into consolidated securitization vehicles		10,800,000,000			12,500,000,000
Consolidated VIE | Securitization Vehicles | Alternative investments
Assets:
Other invested assets		0			0
Consolidated VIE | Securitization Vehicles | Investment real estate
Assets:
Other invested assets		0			0
Consolidated VIE | Affordable Housing Partnerships
Assets:
Bonds available for sale		0			0
Other bond securities		0			0
Equity securities		0			0
Mortgage and other loans receivable		0			0
Short-term investments		0			0
Accrued investment income		0			0
Cash		249,000,000			203,000,000
Other assets		260,000,000			243,000,000
Other		0			0
Total assets		4,388,000,000			4,004,000,000
Liabilities:
Long-term debt		2,515,000,000			2,287,000,000
Other liabilities		198,000,000			187,000,000
Total liabilities		2,713,000,000			2,474,000,000
Consolidated VIE | Affordable Housing Partnerships | Alternative investments
Assets:
Other invested assets		0			0
Consolidated VIE | Affordable Housing Partnerships | Investment real estate
Assets:
Other invested assets		3,879,000,000			3,558,000,000
Consolidated VIE | Other
Assets:
Bonds available for sale		0			0
Other bond securities		0			0
Equity securities		0			0
Mortgage and other loans receivable		0			0
Short-term investments		20,000,000			27,000,000
Accrued investment income		0			0
Cash		0			0
Other assets		0			0
Other		2,000,000			2,000,000
Total assets		22,000,000			29,000,000
Liabilities:
Long-term debt		0			2,000,000
Other liabilities		9,000,000			10,000,000
Total liabilities		9,000,000			12,000,000
Consolidated VIE | Other | Alternative investments
Assets:
Other invested assets		0			0
Consolidated VIE | Other | Investment real estate
Assets:
Other invested assets		0			0
Unconsolidated VIE
Assets:
Other invested assets		6,800,000,000			6,800,000,000
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Total VIE Assets		339,462,000,000			326,250,000,000
Maximum Exposure to Loss, On-Balance Sheet		6,985,000,000			6,983,000,000
Maximum Exposure to Loss, Off-Balance Sheet		3,907,000,000			3,823,000,000
Total maximum exposure to loss		10,892,000,000			10,806,000,000
Unconsolidated VIE | Real Estate and Investment Entities
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Total VIE Assets		335,307,000,000			321,716,000,000
Maximum Exposure to Loss, On-Balance Sheet		6,482,000,000			6,420,000,000
Maximum Exposure to Loss, Off-Balance Sheet		3,378,000,000			3,273,000,000
Total maximum exposure to loss		9,860,000,000			9,693,000,000
Unconsolidated VIE | Affordable Housing Partnerships
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Total VIE Assets		2,429,000,000			2,801,000,000
Maximum Exposure to Loss, On-Balance Sheet		300,000,000			368,000,000
Maximum Exposure to Loss, Off-Balance Sheet		1,000,000			4,000,000
Total maximum exposure to loss		301,000,000			372,000,000
Unconsolidated VIE | Other
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Total VIE Assets		1,726,000,000			1,733,000,000
Maximum Exposure to Loss, On-Balance Sheet		203,000,000			195,000,000
Maximum Exposure to Loss, Off-Balance Sheet		528,000,000			546,000,000
Total maximum exposure to loss		731,000,000			$ 741,000,000
Indirectly wholly owned subsidiary | Securitization Vehicles
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Payments related to guarantees		0
Indirectly wholly owned subsidiary | Securitization Vehicles | Debt of consolidated investments
Liabilities:
Long-term debt		125,000,000
Total assets of unconsolidated VIEs as well as maximum exposure to loss
Repayment of debt		$ 50,000,000

[1] See Note 8 for details of balances associated with variable interest entities.