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DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets | $ 646 | $ 450
Gross amount of liabilities offset in balance sheet | 0 | 0
Net amount of derivative assets presented in balance sheet | 646 | 450
Financial instruments, amount not offset | (375) | (295)
Derivative, collateral, obligation to return securities | (21) | (73)
Derivative, collateral, obligation to return cash | (249) | (76)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement | 1 | 6
Derivative asset, not subject to master netting arrangement | 99 | 133
Derivative asset, fair value, amount offset against collateral, not subject to master netting agreement | 99 | 133
Derivative asset, fair value, gross asset including not subject to master netting arrangement | 745 | 583
Net amount of derivative assets presented in balance sheet | 745 | 583
Derivative asset, fair value, amount offset against collateral | 100 | 139
Gross amounts of recognized financial instruments | 3,572 | 1,523
Gross amounts offset in balance sheet | 0 | 0
Net amounts of assets presented in balance sheet | 3,572 | 1,523
Carrying value of financial instruments not offset in balance sheet | (375) | (295)
Securities collateral, not offset in balance sheet | (21) | (73)
Cash collateral, not offset in balance sheet | (3,076) | (1,016)
Financial instruments, amount of assets offset against collateral | 100 | 139
Over the Counter - Bilateral |  |
Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets | 646 | 450
Gross amount of liabilities offset in balance sheet | 0 | 0
Net amount of derivative assets presented in balance sheet | 646 | 450
Financial instruments, amount not offset | (375) | (295)
Derivative, collateral, obligation to return securities | (21) | (73)
Derivative, collateral, obligation to return cash | (249) | (76)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement | 1 | 6
Derivative asset, not subject to master netting arrangement | 99 | 133
Derivative asset, fair value, amount offset against collateral, not subject to master netting agreement | 99 | 133
Securities Lending and Similar Arrangements |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized financial instruments | 2,827 | 940
Gross amounts offset in balance sheet | 0 | 0
Net amounts of assets presented in balance sheet | 2,827 | 940
Carrying value of financial instruments not offset in balance sheet | 0 | 0
Securities collateral, not offset in balance sheet | 0 | 0
Cash collateral, not offset in balance sheet | (2,827) | (940)
Financial instruments, amount of assets offset against collateral | $ 0 | $ 0

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