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SHORT-TERM BORROWINGS - Non-Revolving Credit Facility (Details)
 1 Months Ended 12 Months Ended
Feb. 28, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Feb. 28, 2023
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Jun. 30, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]              
Borrowings   $ 32,855,000,000       $ 18,873,000,000  
Credit facilities              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity   1,000,000,000         $ 1,600,000,000
Available liquidity         $ 1,200,000,000    
Repayments of short-term borrowings   495,000,000          
Proceeds received from short-term borrowings   865,000,000          
Credit facilities | Changes In Significant Commitments              
Disclosure of detailed information about borrowings [line items]              
Repayments of short-term borrowings $ 400,000,000            
Non-Revolving Credit Facility, Maturing In 2023              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity   375,000,000          
Borrowings   375,000,000          
Proceeds received from short-term borrowings   370,000,000          
Non-Revolving Credit Facility, Maturing In 2024              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity   375,000,000          
Non-Revolving Credit Facility, Maturing In 2024 | Forecast              
Disclosure of detailed information about borrowings [line items]              
Borrowings     $ 186,000,000 $ 273,000,000      
Non-Revolving Credit Facility, Maturing One Year When Drawn              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity   $ 250,000,000