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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%