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Risk Management Activities - Cash Flow Hedges (Details) - Foreign exchange forward contracts – foreign-denominated receipts/expenditures - Cash flow hedges - Currency risk
$ in Millions, $ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
AUD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]          
Notional amount sold       $ 71  
Derivative, notional amount purchased         $ 54
Financial assets, at fair value       $ (2)  
Within one year          
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]          
Notional amount sold $ 10   $ 19    
Financial liabilities, at fair value $ 0        
Within one year | Minimum          
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]          
Derivative, notional amount purchased   $ 8      
Within one year | Maximum          
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]          
Derivative, notional amount purchased   $ 14