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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Financial Position (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]    
Current Assets $ 2,010 $ 586
Current Liabilities 6,197 2,760
Non-controlling interests 703 1,150
Equity in Net Assets Attributable to the partnership [1] (2,127) (1,722)
Non-Wholly Owned Subsidiaries    
Disclosure of subsidiaries [line items]    
Current Assets 917 586
Non-Current Assets 8,076 8,758
Current Liabilities 1,594 536
Non-Current Liabilities 5,313 6,013
Non-controlling interests 703 1,150
Equity in Net Assets Attributable to the partnership 1,383 1,645
U.K. regulated distribution operation    
Disclosure of subsidiaries [line items]    
Current Assets 249 181
Non-Current Assets 4,961 5,264
Current Liabilities 316 333
Non-Current Liabilities 3,285 3,241
Non-controlling interests 314 367
Equity in Net Assets Attributable to the partnership 1,295 1,504
Brazilian regulated gas transmission operation    
Disclosure of subsidiaries [line items]    
Current Assets 668 405
Non-Current Assets 3,115 3,494
Current Liabilities 1,278 203
Non-Current Liabilities 2,028 2,772
Non-controlling interests 389 783
Equity in Net Assets Attributable to the partnership $ 88 $ 141
[1] Common equity is attributable to the partnership prior to the special distribution and subsequently as a result of the partnership holding all of the class C shares issued by our company. Please refer to Note 3(b), Basis of Presentation and Significant Accounting Policies, for further details.