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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2019 USD ($) shares | Feb. 05, 2019 CAD ($) $ / shares shares | Oct. 30, 2018 USD ($) | Oct. 30, 2018 CAD ($) | Oct. 10, 2017 CAD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Sep. 10, 2018 USD ($) | Sep. 10, 2018 CAD ($) | Apr. 17, 2017 CAD ($) | Feb. 22, 2017 CAD ($)
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  |  |  |  | $ 14 | $ 992 | $ 755 |  |  |  |
Share issue related cost |  |  |  |  |  | $ 28 | $ 20 |  |  |  |  |  |  |
Medium-term Notes, Maturing September 11, 2028 [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |
Medium-term Notes, Maturing September 11, 2028 [Domain] | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 377 |  |  |
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 4.20% |  |  | 4.20% | 4.20% |  |
Medium-term Notes, Maturing September 11, 2028 [Domain] | Fixed interest rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 4.70% | 4.70% |  |
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |
Medium-term notes, maturing February 22, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 | $ 300
Medium-term notes, maturing February 22, 2024 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 3.30% |  |  |  |  | 3.30% | 3.30%
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |
Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 4.10%
Medium Term Notes, Maturing October 30, 2018 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |
Debt Issuers | Medium-term notes, maturing February 22, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Debt Issuers | Medium-term notes, maturing February 22, 2024 | Fixed interest rate | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.10%
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 10, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
Debt Issuers | Medium Term Notes, Maturing October 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  |  |  | $ 125 |  |  |  |  |  |  |  |  |  |
Debt Issuers | Medium Term Notes, Maturing October 30, 2018 | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount repaid |  |  | $ 94 |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  | 18.0 | 12.0 | 10.0 |  |  |  |
Subsequent Event | BIPIC Series 1 Senior Preferred Shares [Domain] | Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares | 4.0 | 4.0 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | BIPIC Series 1 Senior Preferred Shares [Domain] | Preferred Unitholders Capital | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | BIPIC Series 1 Senior Preferred Shares [Domain] | Preferred Unitholders Capital | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information about consolidated structured entities [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |

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