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DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Offsetting Assets [Line Items] |  |
Gross amount of recognized derivative assets | $ 331 | $ 1,080
Gross amount of liabilities offset in balance sheet | 0 | 0
Net amount of derivative assets presented in the balance sheet | 331 | 1,080
Financial instruments, amount not offset | (219) | (698)
Derivative, collateral, obligation to return securities | 0 | 0
Derivative, collateral, obligation to return cash | (112) | (382)
Derivative asset, fair value, amount offset against collateral, subject to master netting agreement | 0 | 0
Derivative asset, not subject to master netting arrangement | 148 | 127
Derivative asset, fair value, amount offset against collateral, not subject to master netting agreement | 148 | 127
Derivative asset, fair value, gross asset including not subject to master netting arrangement | 479 | 1,207
Net amount of derivative assets presented in balance sheet | 479 | 1,207
Derivative asset, fair value, amount offset against collateral | 148 | 127
Gross amounts of recognized financial instruments | 988 | 1,720
Gross amounts offset in balance sheet | 0 | 0
Net amounts of assets presented in balance sheet | 988 | 1,720
Carrying value of financial instruments not offset in balance sheet | (219) | (698)
Securities collateral, not offset in balance sheet | 0 | 0
Cash collateral, not offset in balance sheet | (621) | (895)
Financial instruments, amount offset against collateral | 148 | 127
Securities lending and similar arrangements |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized financial instruments | 509 | 513
Gross amounts offset in balance sheet | 0 | 0
Net amounts of assets presented in balance sheet | 509 | 513
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 | (509) | (513)
Financial instruments, amount offset against collateral | $ 0 | $ 0

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