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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets $ 5,841 $ 2,276 $ 1,512
Non-Current Assets 50,467 34,304 27,965
Total assets 56,308 36,580 29,477
Current Liabilities 5,439 2,417 1,564
Non-Current Liabilities 28,692 19,495 14,439
Total liabilities 34,131 21,912 $ 16,003
Associates and Joint Ventures      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 3,189 2,539  
Non-Current Assets 42,291 30,504  
Total assets 45,480 33,043  
Current Liabilities 3,964 2,900  
Non-Current Liabilities 21,573 13,670  
Total liabilities 25,537 16,570  
Total Net Assets 19,943 16,473  
Attributable to Other Ownership Interests 14,976 11,882  
Attributable to Partnership's Share 4,967 4,591  
Utilities      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 870 289  
Non-Current Assets 6,499 2,227  
Total assets 7,369 2,516  
Current Liabilities 686 325  
Non-Current Liabilities 4,152 1,391  
Total liabilities 4,838 1,716  
Total Net Assets 2,531 800  
Attributable to Other Ownership Interests 2,286 708  
Attributable to Partnership's Share 245 92  
Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 1,233 1,520  
Non-Current Assets 18,327 15,892  
Total assets 19,560 17,412  
Current Liabilities 1,948 1,876  
Non-Current Liabilities 8,444 6,447  
Total liabilities 10,392 8,323  
Total Net Assets 9,168 9,089  
Attributable to Other Ownership Interests 6,770 6,592  
Attributable to Partnership's Share 2,398 2,497  
Energy      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 166 178  
Non-Current Assets 5,696 5,307  
Total assets 5,862 5,485  
Current Liabilities 275 162  
Non-Current Liabilities 4,013 2,875  
Total liabilities 4,288 3,037  
Total Net Assets 1,574 2,448  
Attributable to Other Ownership Interests 307 1,265  
Attributable to Partnership's Share 1,267 1,183  
Data Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 912 447  
Non-Current Assets 11,636 6,692  
Total assets 12,548 7,139  
Current Liabilities 1,042 438  
Non-Current Liabilities 4,908 2,902  
Total liabilities 5,950 3,340  
Total Net Assets 6,598 3,799  
Attributable to Other Ownership Interests 5,569 3,089  
Attributable to Partnership's Share 1,029 710  
Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 8 105  
Non-Current Assets 133 386  
Total assets 141 491  
Current Liabilities 13 99  
Non-Current Liabilities 56 55  
Total liabilities 69 154  
Total Net Assets 72 337  
Attributable to Other Ownership Interests 44 228  
Attributable to Partnership's Share $ 28 $ 109  
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 11.00% 11.00%  
Bottom of range | Energy      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and voting Interest 20.00% 20.00%  
Bottom of range | Data Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and voting Interest 12.00% 21.00%  
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 | Energy      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and voting Interest 50.00% 50.00%  
Top of range | Data Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and voting Interest 29.00% 21.00%  
Top of range | Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and voting Interest 50.00% 50.00%