XML 154 R126.htm IDEA: XBRL DOCUMENT v3.20.4
Risk Management Activities - Cash Flow Hedges (Details) - Foreign exchange forward contracts – foreign-denominated receipts/expenditures - Cash flow hedges - Currency risk
$ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]        
Notional amount sold $ 71   $ 124  
Derivative, notional amount purchased   $ 54   $ 95
Financial liabilities, at fair value $ (2)      
Financial assets, at fair value     $ 0