DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	$ 1,081	$ 858
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in balance sheet	1,081	858
Financial instruments, amount not offset	(167)	(471)
Derivative, collateral, obligation to return securities	(135)	(53)
Derivative, collateral, obligation to return cash	(775)	(334)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement	4	0
Derivative asset, not subject to master netting arrangement	65	78
Derivative asset, fair value, gross asset including not subject to master netting arrangement	1,146	936
Net amount of derivative assets presented in balance sheet	1,146	936
Derivative asset, fair value, amount offset against collateral	69	78
Securities lending, gross amounts of recognized financial instruments	2,691	2,124
Securities lending, gross amounts offset in balance sheet	0	0
Securities lending, net amounts of assets presented in balance sheet	2,691	2,124
Securities lending, carrying value of financial instruments not offset in balance sheet	0	0
Securities lending, securities collateral, not offset in balance sheet	0	0
Securities lending, cash collateral, not offset in balance sheet	(2,691)	(2,124)
Securities lending, financial instruments, amount of assets offset against collateral	0	0
Gross amount of recognized assets	3,837	3,060
Gross amounts offset in balance sheet	0	0
Net amounts of assets presented in balance sheet	3,837	3,060
Carrying value of financial instruments not offset in balance sheet	(167)	(471)
Securities collateral, not offset in balance sheet	(135)	(53)
Cash collateral, not offset in balance sheet	(3,466)	(2,458)
Financial instruments, amount of assets offset against collateral	69	78
Over the Counter - Bilateral
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	1,081	858
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in balance sheet	1,081	858
Financial instruments, amount not offset	(167)	(471)
Derivative, collateral, obligation to return securities	(135)	(53)
Derivative, collateral, obligation to return cash	(775)	(334)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement	4	0
Derivative asset, not subject to master netting arrangement	$ 65	$ 78