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DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities |  | $ (601) |  | $ (371)
Gross amount of assets offset in balance sheet |  | 0 |  | 0
Net amount of derivative liabilities presented in balance sheet |  | (601) |  | (371)
Financial instruments, amount not offset against derivative liabilities in balance sheet |  | 0 |  | 0
Derivative, collateral, right to reclaim cash |  | 259 | [1] | 3
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | (342) |  | (351)
Derivative, collateral, right to reclaim securities and cash | [2] |  |  | 20
Derivative, collateral, right to reclaim securities |  |  |  | 17
Foreign currency swaps |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities |  | (436) |  | (314)
Gross amount of assets offset in balance sheet |  | 0 |  | 0
Net amount of derivative liabilities presented in balance sheet |  | (436) |  | (314)
Financial instruments, amount not offset against derivative liabilities in balance sheet |  | 0 |  | 0
Derivative, collateral, right to reclaim cash |  | 168 |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | (268) |  | (313)
Derivative, collateral, right to reclaim securities and cash |  |  |  | 1
Foreign currency forwards |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities |  | (109) |  | (49)
Gross amount of assets offset in balance sheet |  | 0 |  | 0
Net amount of derivative liabilities presented in balance sheet |  | (109) |  | (49)
Financial instruments, amount not offset against derivative liabilities in balance sheet |  | 0 |  | 0
Derivative, collateral, right to reclaim cash |  | 37 |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | (72) |  | (31)
Derivative, collateral, right to reclaim securities and cash |  |  |  | 18
Foreign currency options |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities |  | (56) |  | (8)
Gross amount of assets offset in balance sheet |  | 0 |  | 0
Net amount of derivative liabilities presented in balance sheet |  | (56) |  | (8)
Financial instruments, amount not offset against derivative liabilities in balance sheet |  | 0 |  | 0
Derivative, collateral, right to reclaim cash |  | 54 |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | (2) |  | (7)
Derivative, collateral, right to reclaim securities and cash |  |  |  | 1
Offsetting liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized financial instruments |  | (1,654) |  | (1,312)
Gross amounts offset in balance sheet |  | 0 |  | 0
Net amounts of liabilities presented in balance sheet |  | (1,654) |  | (1,312)
Carrying value of financial instruments not offset in balance sheet |  | 1,029 |  | 921
Collateral not offset in balance sheet |  | 259 |  | 20
Financial instruments, amount offset against collateral |  | (366) |  | (371)
Offsetting liabilities | Securities lending and similar arrangements |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized financial instruments |  | (1,053) |  | (941)
Gross amounts offset in balance sheet |  | 0 |  | 0
Net amounts of liabilities presented in balance sheet |  | (1,053) |  | (941)
Carrying value of financial instruments not offset in balance sheet |  | 1,029 |  | 921
Collateral not offset in balance sheet |  | 0 |  | 0
Financial instruments, amount offset against collateral |  | $ (24) |  | $ (20)
[1] | Consists entirely of cash.
[2] | Consists of $17 of pledged securities and $3 of cash

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