PLEDGED ASSETS, RESTRICTED CASH, COLLATERAL, GUARANTEES AND COMMITMENTS - Guarantees (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) trust margin	Dec. 31, 2021 USD ($)
Maximum potential amount of future payments
Expire Within One Year	$ 281,500,000,000	$ 298,800,000,000
Expire After One Year	104,600,000,000	128,200,000,000
Total amount outstanding	386,100,000,000	427,000,000,000.0
Carrying value	1,376,000,000	1,409,000,000
Compensation for standard representations and warranties	0
Stated or notional amounts included in the indemnification clauses	$ 0
Number of trusts funded by the reinsurer | trust	2
Liability related to long-term care insurance indemnification	$ 0	0
Amount of cash initial margin collected and remitted	18,000,000,000	18,700,000,000
Cash collateral available to reimburse losses realized under guarantees and indemnifications	51,800,000,000	56,500,000,000
Available-for-sale securities, pledged to creditors	63,700,000,000	84,200,000,000
Letters of credit in favor of the Company held as collateral	3,700,000,000	4,100,000,000
Investment Grade
Maximum potential amount of future payments
Total amount outstanding	87,200,000,000	91,900,000,000
Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	21,300,000,000	25,800,000,000
Not Rated
Maximum potential amount of future payments
Total amount outstanding	277,600,000,000	309,300,000,000
Financial standby letters of credit
Maximum potential amount of future payments
Expire Within One Year	31,300,000,000	34,300,000,000
Expire After One Year	58,300,000,000	58,400,000,000
Total amount outstanding	89,600,000,000	92,700,000,000
Carrying value	905,000,000	791,000,000
Financial standby letters of credit | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	77,900,000,000	81,400,000,000
Financial standby letters of credit | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	10,400,000,000	11,300,000,000
Financial standby letters of credit | Not Rated
Maximum potential amount of future payments
Total amount outstanding	1,300,000,000	0
Performance guarantees
Maximum potential amount of future payments
Expire Within One Year	6,100,000,000	6,600,000,000
Expire After One Year	5,600,000,000	6,400,000,000
Total amount outstanding	11,700,000,000	13,000,000,000.0
Carrying value	65,000,000	47,000,000
Performance guarantees | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	9,300,000,000	10,500,000,000
Performance guarantees | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	2,400,000,000	2,500,000,000
Performance guarantees | Not Rated
Maximum potential amount of future payments
Total amount outstanding	0	0
Derivative instruments deemed to be guarantees
Maximum potential amount of future payments
Expire Within One Year	18,500,000,000	14,600,000,000
Expire After One Year	30,000,000,000.0	48,900,000,000
Total amount outstanding	48,500,000,000	63,500,000,000
Carrying value	353,000,000	514,000,000
Derivative instruments deemed to be guarantees | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Derivative instruments deemed to be guarantees | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Derivative instruments deemed to be guarantees | Not Rated
Maximum potential amount of future payments
Total amount outstanding	48,500,000,000	63,500,000,000
Loans sold with recourse
Maximum potential amount of future payments
Expire Within One Year	0	0
Expire After One Year	1,700,000,000	1,700,000,000
Total amount outstanding	1,700,000,000	1,700,000,000
Carrying value	13,000,000	15,000,000
Repurchase reserve for Consumer mortgages representations and warranties	10,000,000	19,000,000
Loans sold with recourse | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Loans sold with recourse | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Loans sold with recourse | Not Rated
Maximum potential amount of future payments
Total amount outstanding	1,700,000,000	1,700,000,000
Securities lending indemnifications
Maximum potential amount of future payments
Expire Within One Year	95,900,000,000	121,900,000,000
Expire After One Year	0	0
Total amount outstanding	95,900,000,000	121,900,000,000
Carrying value	0	0
Securities lending indemnifications | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Securities lending indemnifications | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Securities lending indemnifications | Not Rated
Maximum potential amount of future payments
Total amount outstanding	95,900,000,000	121,900,000,000
Credit card merchant processing
Maximum potential amount of future payments
Expire Within One Year	129,600,000,000	119,400,000,000
Expire After One Year	0	0
Total amount outstanding	129,600,000,000	119,400,000,000
Carrying value	1,000,000	1,000,000
Credit card merchant processing | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Credit card merchant processing | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Credit card merchant processing | Not Rated
Maximum potential amount of future payments
Total amount outstanding	129,600,000,000	119,400,000,000
Credit card arrangements with partners
Maximum potential amount of future payments
Expire Within One Year	0	0
Expire After One Year	600,000,000	800,000,000
Total amount outstanding	600,000,000	800,000,000
Carrying value	7,000,000	7,000,000
Credit card arrangements with partners | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Credit card arrangements with partners | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Credit card arrangements with partners | Not Rated
Maximum potential amount of future payments
Total amount outstanding	600,000,000	800,000,000
Other
Maximum potential amount of future payments
Expire Within One Year	100,000,000	2,000,000,000.0
Expire After One Year	8,400,000,000	12,000,000,000.0
Total amount outstanding	8,500,000,000	14,000,000,000.0
Carrying value	32,000,000	34,000,000
Other | Investment Grade
Maximum potential amount of future payments
Total amount outstanding	0	0
Other | Non-Investment Grade
Maximum potential amount of future payments
Total amount outstanding	8,500,000,000	12,000,000,000.0
Other | Not Rated
Maximum potential amount of future payments
Total amount outstanding	$ 0	$ 2,000,000,000.0
Futures and over the counter derivatives clearing
Maximum potential amount of future payments
Number of types of margin | margin	2