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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ / shares in Units, $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 CAD ($) | Nov. 06, 2019 CAD ($) | Feb. 05, 2019 USD ($) shares | Feb. 05, 2019 CAD ($) $ / shares shares | Oct. 30, 2018 CAD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Apr. 07, 2020 CAD ($) | Oct. 07, 2019 CAD ($) | Sep. 10, 2018 CAD ($)
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  | $ 14,743 | $ 15,855 |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  |  |  | $ 9 | $ 781 | $ (16) |  |  |
Medium-term Notes, Maturing September 1, 2032 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) | $ 500 |  |  |  |  |  |  |  |  |  |
Amount repaid | $ 450 |  |  |  |  |  |  |  |  |  |
Medium-term Notes, Maturing September 11, 2028 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  |  | $ 200 |  | $ 500
Medium-term Notes, Maturing October 9, 2029 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Notional Amount (U.S. Dollars) |  |  |  |  |  |  |  |  | $ 200 | $ 500 |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 3.40% | 3.50% |
Notional amount swapped |  |  |  |  |  |  |  |  |  | $ 92 |
Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  | 8,000,000.0 | 0 | 18,000,000.0 |  |  |
Preferred Unitholders Capital | BIPIC Series 1 Senior Preferred Shares |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  | 4,000,000 | 4,000,000 |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  | $ 25 |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  | 5.85% | 5.85% |  |  |  |  |  |  |
Underwriting related cost |  |  | $ 2 |  |  |  |  |  |  |  |
Share issue related cost |  |  | 1 |  |  |  |  |  |  |  |
Preferred Unitholders Capital | BIPIC Series 1 Senior Preferred Shares | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  | $ 100 |  |  |  |  |  |  |
Preferred Unitholders Capital | BIPIC Series 1 Senior Preferred Shares | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  | $ 75 |  |  |  |  |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing September 1, 2032 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 2.90% |  |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing September 11, 2028 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 4.20% |  |  |  |  |
Fixed interest rate | Medium-term Notes, Maturing October 9, 2029 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.40% |  |  |  |  |
Debt Issuers | Medium-term Notes, Maturing October 9, 2029 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  | $ 375 |  |  |  |  |  |  |  |  |
Debt Issuers | Medium Term Notes, Maturing October 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  |  |  |  | $ 125 |  |  |  |  |  |
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing September 1, 2032 | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.90% |  |  |  |  |  |  |  |  |  |
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing September 1, 2032 | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.90% |  |  |  |  |  |  |  |  |  |
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing September 11, 2028 | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 4.20% |  | 4.20%
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing September 11, 2028 | USD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 4.70%
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing October 9, 2029 | CAD |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 3.40% | 3.40% |

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