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DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets | $ 264 | $ 282
Gross amount of liabilities offset in balance sheet | 0 | 0
Net amount of derivative assets presented in balance sheet | 264 | 282
Financial instruments, amount not offset | (38) | (96)
Derivative, collateral, obligation to return securities | (78) | (53)
Derivative, collateral, obligation to return cash | (148) | (130)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement | 0 | 3
Derivative asset, not subject to master netting arrangement | 57 | 55
Derivative asset, fair value, gross asset including not subject to master netting arrangement | 321 | 337
Net amount of derivative assets presented in balance sheet | 321 | 337
Derivative asset, fair value, amount offset against collateral | 57 | 58
Securities lending, gross amounts of recognized financial instruments | 3,334 | 1,480
Securities lending, gross amounts offset in balance sheet | 0 | 0
Securities lending, net amounts of assets presented in balance sheet | 3,334 | 1,480
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 | (3,334) | (1,480)
Securities lending, financial instruments, amount of assets offset against collateral | 0 | 0
Gross amount of recognized assets | 3,655 | 1,817
Gross amounts offset in balance sheet | 0 | 0
Net amounts of assets presented in balance sheet | 3,655 | 1,817
Carrying value of financial instruments not offset in balance sheet | (38) | (96)
Securities collateral, not offset in balance sheet | (78) | (53)
Cash collateral, not offset in balance sheet | (3,482) | (1,610)
Financial instruments, amount of assets offset against collateral | 57 | 58
OTC - Bilateral |  |
Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets | 264 | 271
Gross amount of liabilities offset in balance sheet | 0 | 0
Net amount of derivative assets presented in balance sheet | 264 | 271
Financial instruments, amount not offset | (38) | (85)
Derivative, collateral, obligation to return securities | (78) | (53)
Derivative, collateral, obligation to return cash | (148) | (130)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement | 0 | 3
Derivative asset, not subject to master netting arrangement | $ 57 | 55
OTC- Cleared |  |
Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets |  | 11
Gross amount of liabilities offset in balance sheet |  | 0
Net amount of derivative assets presented in balance sheet |  | 11
Financial instruments, amount not offset |  | (11)
Derivative, collateral, obligation to return securities |  | 0
Derivative, collateral, obligation to return cash |  | 0
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement |  | $ 0

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