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CORPORATE BORROWINGS - Narrative (Details) $ in Millions, ¥ in Billions, $ in Billions | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 JPY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 JPY (¥)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Corporate borrowings | $ 10,875 |  |  | $ 9,077 |  |
Fixed rate | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Annual Rate | 4.20% | 4.20% | 4.20% | 4.40% | 4.40% | 4.40%
U.S. dollars | Japanese yen |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Corporate borrowings | $ 87 |  |  | $ 97 |  |
U.S. dollars | Canadian dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Corporate borrowings | $ 1,800 |  |  | $ 2,300 |  |
Canadian dollars | Canadian dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Corporate borrowings |  | $ 2.3 |  |  | $ 2.9 |
Japanese yen | Japanese yen |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Corporate borrowings | ¥ |  |  | ¥ 10.0 |  |  | ¥ 10.0

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