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VARIABLE INTEREST ENTITIES (Details) $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 02, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 USD ($) | Jun. 04, 2019 USD ($)
Term Loan | Gray Oak Holdings LLC |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Maximum capacity of borrowings |  |  |  |  | $ 1,230
Long-term debt |  |  |  | $ 551 |
Term Loan | Gray Oak Holdings LLC | Subsequent Event |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Maximum capacity of borrowings | $ 1,317 |  |  |  |
VIE, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Ownership interest in VIE (as a percent) |  | 22.80% |  |  |
Carrying amount of investment |  | $ 0 | $ 455,000,000 |  |
VEI, maximum loss exposure, amount |  |  | $ 911,000,000 |  |
VIE, Not Primary Beneficiary | Gray Oak Holdings LLC |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Ownership interest in VIE (as a percent) |  | 35.00% |  |  |
VIE, Not Primary Beneficiary | Term Loan |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  | $ 125 |
Guarantor obligations, maximum exposure, undiscounted |  |  |  |  | $ 300
VIE, Not Primary Beneficiary | Term Loan | Gray Oak Holdings LLC | Subsequent Event |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Debt instrument, accordion feature, increase | $ 87 |  |  |  |

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