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REVENUES - Revenues by Service Line (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Revenues $ 1,643 $ 1,430 $ 1,619
Gas Transmission      
Disclosure of operating segments [line items]      
Revenues 1,074 942 1,141
Distribution      
Disclosure of operating segments [line items]      
Revenues 374 346 307
Connections      
Disclosure of operating segments [line items]      
Revenues 167 118 152
Other      
Disclosure of operating segments [line items]      
Revenues $ 28 $ 24 $ 19