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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets $ 3,711 $ 5,841
Non-Current Assets 57,620 50,467
Total assets 61,331 56,308
Current Liabilities 5,524 5,439
Non-Current Liabilities 34,134 28,692
Total liabilities 39,658 34,131
Total    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 2,948 3,189
Non-Current Assets 51,725 42,291
Total assets 54,673 45,480
Current Liabilities 3,972 3,964
Non-Current Liabilities 24,244 21,573
Total liabilities 28,216 25,537
Total Net Assets 26,457 19,943
Attributable to Other Ownership Interests 20,929 14,976
Attributable to Partnership's Share 5,528 4,967
Utilities    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 646 870
Non-Current Assets 6,142 6,499
Total assets 6,788 7,369
Current Liabilities 487 686
Non-Current Liabilities 4,238 4,152
Total liabilities 4,725 4,838
Total Net Assets 2,063 2,531
Attributable to Other Ownership Interests 1,810 2,286
Attributable to Partnership's Share 253 245
Transport    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 1,266 1,233
Non-Current Assets 25,762 18,327
Total assets 27,028 19,560
Current Liabilities 1,959 1,948
Non-Current Liabilities 9,836 8,444
Total liabilities 11,795 10,392
Total Net Assets 15,233 9,168
Attributable to Other Ownership Interests 12,474 6,770
Attributable to Partnership's Share 2,759 2,398
Midstream    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 173 166
Non-Current Assets 6,392 5,696
Total assets 6,565 5,862
Current Liabilities 249 275
Non-Current Liabilities 4,033 4,013
Total liabilities 4,282 4,288
Total Net Assets 2,283 1,574
Attributable to Other Ownership Interests 911 307
Attributable to Partnership's Share 1,372 1,267
Data    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 841 912
Non-Current Assets 13,308 11,636
Total assets 14,149 12,548
Current Liabilities 1,263 1,042
Non-Current Liabilities 6,081 4,908
Total liabilities 7,344 5,950
Total Net Assets 6,805 6,598
Attributable to Other Ownership Interests 5,672 5,569
Attributable to Partnership's Share 1,133 1,029
Corporate    
Disclosure Of Associates And Joint Ventures [Line Items]    
Current Assets 22 8
Non-Current Assets 121 133
Total assets 143 141
Current Liabilities 14 13
Non-Current Liabilities 56 56
Total liabilities 70 69
Total Net Assets 73 72
Attributable to Other Ownership Interests 62 44
Attributable to Partnership's Share $ 11 $ 28
North American natural gas transmission operation    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 50.00%  
Loans and receivables $ 500  
Bottom of range | Utilities    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 11.00% 11.00%
Bottom of range | Transport    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 6.00% 11.00%
Bottom of range | Midstream    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 20.00% 20.00%
Bottom of range | Data    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 12.00% 12.00%
Bottom of range | Corporate    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 25.00% 25.00%
Top of range | Utilities    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 20.00% 20.00%
Top of range | Transport    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 50.00% 50.00%
Top of range | Midstream    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 50.00% 50.00%
Top of range | Data    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 21.00% 21.00%
Top of range | Corporate    
Disclosure Of Associates And Joint Ventures [Line Items]    
Ownership and voting Interest 50.00% 50.00%