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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Corporate revolving credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 1,210 | $ 820
Corporate revolving credit facility | Floating interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, adjustment to interest rate basis | 1.20% |
Syndicated Revolving Credit Facility [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 0 | 0
Syndicated Revolving Credit Facility [Member] | Floating interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, adjustment to interest rate basis | 2.10% |
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 331 | 346
Medium Term Notes, Public - Canadian - Maturing March 11, 2022 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 3.50% |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 221 | 231
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 3.30% |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 294 | 308
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 3.30% |
Medium-term Notes, Maturing September 11, 2028 [Domain] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 516 | 384
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 4.20% |
Medium-term Notes, Maturing October 9, 2029 [Domain] |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 516 | 386
Medium-term Notes, Maturing October 9, 2029 [Domain] | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 3.40% |
Corporate borrowings |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 3,074 | 2,475
Corporate Borrowings, Outstanding Principal | 3,088 | 2,475
Corporate Borrowings, Deferred Financing Costs and Other | $ (14) | $ 0

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- Definition Corporate Borrowings, Outstanding Principal + References No definition available. + Details
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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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