INSURANCE LIABILITIES AND ANNUITY BENEFITS - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Feb. 03, 2025 USD ($)	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Insurance revenues		$ 875	$ 899	$ 2,681	$ 2,649
Net income (loss)		$ 2,154	$ 1,842	$ 6,147	4,676
Percent of portfolio held in office sector		25.00%		25.00%
Policyholder account balance		$ 1,407		$ 1,407		$ 1,612
Policyholder account balance, surrender, withdrawal and benefit payments				367	323
Policyholder account balance, net additions and interest credited				$ 197	$ 206
Policyholder account balance, crediting rate		3.00%	6.00%	3.00%	6.00%
Future policy benefit, remeasurement charge				$ 126
Future policy benefit, remeasurement charge, after tax				100
Net premium ratio update, favorable (unfavorable) adjustment				(166)	$ (54)
Insufficient gross premiums adjustment				189	107
Canadian life and health insurance
Disaggregation of Revenue [Line Items]
Proceeds from ceding commission	$ 128
Executed novation benefit		$ 275		275
Deferred gain on ceding commission		60		60
Run-off Insurance operations
Disaggregation of Revenue [Line Items]
Insurance revenues		875	$ 899	2,681	2,649
Gross profit (loss)		361	171	714	541
Net income (loss)		287	$ 135	567	$ 427
Investment securities		37,822		37,822		37,352
Limited partnerships		4,925		4,925		4,321
Run-off Insurance operations | CMBS
Disaggregation of Revenue [Line Items]
Estimated fair value		1,841		1,841		1,887
Debt securities, allowance for credit losses		$ 37		$ 37		46
Number of delinquent loans | loan		0		0
Number of nonaccrual loans | loan		0		0
Weighted average loan to value ratio		69.00%		69.00%
Debt service coverage ratio		1.9		1.9
Run-off Insurance operations | Residential mortgage
Disaggregation of Revenue [Line Items]
Estimated fair value		$ 345		$ 345		$ 251