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BORROWINGS - Corporate Borrowings (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Corporate revolving credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 0 | $ 1,131
Corporate revolving credit facility | Floating interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 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] |  |
Annual Rate | 1.20% |
Commercial Paper |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 496 | 0
Commercial Paper | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 0.40% |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 242 | 236
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 | $ 323 | 314
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 | $ 565 | 550
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 | $ 565 | 550
Medium-term Notes, Maturing October 9, 2029 [Domain] | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 3.40% |
Medium-term Notes, Maturing September 1, 2032 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 403 | 392
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 2.90% |
Subordinated Notes, Maturing May 24, 2081 |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 250 | 0
Subordinated Notes, Maturing May 24, 2081 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual Rate | 5.00% |
Corporate borrowings |  |
Disclosure of detailed information about borrowings [line items] |  |
Subsidiary and corporate borrowings | $ 2,822 | 3,158
Corporate Borrowings, Outstanding Principal | 2,844 | 3,173
Corporate Borrowings, Deferred Financing Costs and Other | $ (22) | $ (15)

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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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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