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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Nov. 06, 2019
CAD ($)
Feb. 05, 2019
USD ($)
shares
Feb. 05, 2019
CAD ($)
$ / shares
shares
Oct. 30, 2018
CAD ($)
Oct. 10, 2017
CAD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Oct. 07, 2019
CAD ($)
Sep. 10, 2018
CAD ($)
Apr. 17, 2017
CAD ($)
Feb. 22, 2017
CAD ($)
Disclosure of information about consolidated structured entities [line items]                        
Notional Amount (U.S. Dollars)           $ 15,855 $ 9,966          
Partnership units issued, net of costs and repurchases           $ 781 $ (16) $ 992        
Medium-term Notes, Maturing October 9, 2029                        
Disclosure of information about consolidated structured entities [line items]                        
Notional Amount (U.S. Dollars)                 $ 500,000,000      
Medium-term Notes, Maturing September 11, 2028                        
Disclosure of information about consolidated structured entities [line items]                        
Notional Amount (U.S. Dollars)                   $ 500,000,000    
Preferred Unitholders Capital                        
Disclosure of information about consolidated structured entities [line items]                        
Issued for cash (in shares) | shares           0 18,000,000 12,000,000        
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     $ 100,000,000                  
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 October 9, 2029                        
Disclosure of information about consolidated structured entities [line items]                        
Borrowings, interest rate           3.40%            
Fixed interest rate | Medium Term Notes, Public - Canadian - Maturing October 30, 2020                        
Disclosure of information about consolidated structured entities [line items]                        
Borrowings, interest rate           3.50%            
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 February 22, 2024                        
Disclosure of information about consolidated structured entities [line items]                        
Borrowings, interest rate           3.30%            
Debt Issuers | Medium Term Notes, Public - Canadian - Maturing October 30, 2020                        
Disclosure of information about consolidated structured entities [line items]                        
Amount repaid $ 375,000,000                      
Debt Issuers | Medium-term Notes, Maturing September 11, 2028                        
Disclosure of information about consolidated structured entities [line items]                        
Notional Amount (U.S. Dollars)                   $ 500,000,000    
Debt Issuers | Medium-term Notes, Maturing February 22, 2024                        
Disclosure of information about consolidated structured entities [line items]                        
Notional Amount (U.S. Dollars)                     $ 400,000,000 $ 300,000,000
Debt Issuers | Medium Term Notes, Maturing October 30, 2018                        
Disclosure of information about consolidated structured entities [line items]                        
Amount repaid       $ 125,000,000 $ 400,000,000              
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%      
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%    
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 February 22, 2024 | CAD                        
Disclosure of information about consolidated structured entities [line items]                        
Borrowings, interest rate                     3.30% 3.30%
Debt Issuers | Fixed interest rate | Medium-term Notes, Maturing February 22, 2024 | USD                        
Disclosure of information about consolidated structured entities [line items]                        
Borrowings, interest rate                     4.00% 4.10%