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DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Offsetting Liabilities [Line Items] |  |
Gross amount of recognized derivative liabilities | $ 914 | $ 466
Gross amount of assets offset in balance sheet | 0 | 0
Derivative liability, fair value, amount not offset against collateral | 914 | 466
Financial instruments, amount not offset | (375) | (295)
Derivative, collateral, right to reclaim securities | (491) | (43)
Derivative, collateral, right to reclaim cash | (34) | (69)
Derivative liability, fair value, amount offset against collateral, subject to master netting agreement | 14 | 59
Derivative liability, not subject to master netting arrangement | 356 | 231
Derivative liability, fair value, amount offset against collateral, not subject to master netting agreement | 356 | 231
Derivative liability, fair value, gross liability including not subject to master netting arrangement | 1,270 | 697
Net amount of derivative liabilities presented in balance sheet | 1,270 | 697
Derivative liability, fair value, amount offset against collateral | 370 | 290
Gross Amounts of Recognized Financial Instruments, Offsetting Liabilities | 4,119 | 1,661
Gross Amounts Offset in Statement of Financial Position, Offsetting Liabilities | 0 | 0
Net Amounts of Financial Instruments Presented in Balance Sheet, Offsetting Liabilities | 4,119 | 1,661
Carrying value of financial instruments, liabilities not offset in balance sheet | (3,202) | (1,235)
Securities Collateral, Liabilities Not Offset in Balance Sheet | (491) | (43)
Cash Collateral, Liabilities Not Offset in Balance Sheet | (34) | (69)
Financial instruments, amount of liabilities offset against collateral | 392 | 314
Over the Counter - Bilateral |  |
Offsetting Liabilities [Line Items] |  |
Gross amount of recognized derivative liabilities | 898 | 466
Gross amount of assets offset in balance sheet | 0 | 0
Derivative liability, fair value, amount not offset against collateral | 898 | 466
Financial instruments, amount not offset | (375) | (295)
Derivative, collateral, right to reclaim securities | (491) | (43)
Derivative, collateral, right to reclaim cash | (19) | (69)
Derivative liability, fair value, amount offset against collateral, subject to master netting agreement | 13 | 59
Derivative liability, not subject to master netting arrangement | 356 | 231
Derivative liability, fair value, amount offset against collateral, not subject to master netting agreement | 356 | 231
Securities Lending and Similar Arrangements |  |
Offsetting Liabilities [Line Items] |  |
Gross Amounts of Recognized Financial Instruments, Offsetting Liabilities | 2,849 | 964
Gross Amounts Offset in Statement of Financial Position, Offsetting Liabilities | 0 | 0
Net Amounts of Financial Instruments Presented in Balance Sheet, Offsetting Liabilities | 2,849 | 964
Carrying value of financial instruments, liabilities not offset in balance sheet | (2,827) | (940)
Securities Collateral, Liabilities Not Offset in Balance Sheet | 0 | 0
Cash Collateral, Liabilities Not Offset in Balance Sheet | 0 | 0
Financial instruments, amount of liabilities offset against collateral | 22 | $ 24
Other the Counter - Cleared |  |
Offsetting Liabilities [Line Items] |  |
Gross amount of recognized derivative liabilities | 16 |
Gross amount of assets offset in balance sheet | 0 |
Derivative liability, fair value, amount not offset against collateral | 16 |
Financial instruments, amount not offset | 0 |
Derivative, collateral, right to reclaim securities | 0 |
Derivative, collateral, right to reclaim cash | (15) |
Derivative liability, fair value, amount offset against collateral, subject to master netting agreement | $ 1 |

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