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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets $ 2,276 $ 1,512 $ 1,632
Non-Current Assets 34,304 27,965 19,643
Total assets 36,580 29,477 21,275
Current Liabilities 2,417 1,564 1,515
Non-Current Liabilities 19,495 14,439 10,116
Total liabilities 21,912 16,003 $ 11,631
Associates and Joint Ventures      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 2,539 2,822  
Non-Current Assets 30,504 37,553  
Total assets 33,043 40,375  
Current Liabilities 2,900 2,887  
Non-Current Liabilities 13,670 17,688  
Total liabilities 16,570 20,575  
Total Net Assets 16,473 19,800  
Attributable to Other Ownership Interests 11,882 14,228  
Attributable to Partnership's Share 4,591 5,572  
Utilities      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 289 631  
Non-Current Assets 2,227 9,068  
Total assets 2,516 9,699  
Current Liabilities 325 756  
Non-Current Liabilities 1,391 4,892  
Total liabilities 1,716 5,648  
Total Net Assets 800 4,051  
Attributable to Other Ownership Interests 708 3,037  
Attributable to Partnership's Share 92 1,014  
Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 1,520 1,548  
Non-Current Assets 15,892 17,096  
Total assets 17,412 18,644  
Current Liabilities 1,876 1,396  
Non-Current Liabilities 6,447 7,002  
Total liabilities 8,323 8,398  
Total Net Assets 9,089 10,246  
Attributable to Other Ownership Interests 6,592 7,385  
Attributable to Partnership's Share 2,497 2,861  
Energy      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 178 164  
Non-Current Assets 5,307 5,054  
Total assets 5,485 5,218  
Current Liabilities 162 162  
Non-Current Liabilities 2,875 2,784  
Total liabilities 3,037 2,946  
Total Net Assets 2,448 2,272  
Attributable to Other Ownership Interests 1,265 1,196  
Attributable to Partnership's Share 1,183 1,076  
Data Infrastructure [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 447 464  
Non-Current Assets 6,692 6,281  
Total assets 7,139 6,745  
Current Liabilities 438 561  
Non-Current Liabilities 2,902 2,968  
Total liabilities 3,340 3,529  
Total Net Assets 3,799 3,216  
Attributable to Other Ownership Interests 3,089 2,602  
Attributable to Partnership's Share 710 614  
Corporate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 105 15  
Non-Current Assets 386 54  
Total assets 491 69  
Current Liabilities 99 12  
Non-Current Liabilities 55 42  
Total liabilities 154 54  
Total Net Assets 337 15  
Attributable to Other Ownership Interests 228 8  
Attributable to Partnership's Share $ 109 $ 7  
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 [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Ownership and Voting Interest 21.00% 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% 28.00%  
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 [Member]      
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% 40.00%