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Risk Management - Additional Information (Detail)
$ in Millions
Jun. 30, 2022
CAD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Jun. 30, 2021
CAD ($)
Mar. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Fair value of derivative financial instruments net $ 1,000,000     $ (68,000,000)      
Cash and cash equivalents 3,693,000,000   $ 3,399,000,000 2,873,000,000 $ 1,055,000,000 $ 873,000,000 $ 378,000,000
Uncommitted demand facilities 0     $ 0      
Interest Rate, Foreign Exchange or Cross Currency Interest Rate Swap              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Notional value $ 0            
Trade Receivables | Credit risk              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Average expected credit loss rate 0.10% 0.10%   0.10%      
Trade Receivables | Credit risk | Investment grade counterparties              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Number of days outstanding for accruals, joint operations, trade receivables and net investment in finance leases 60 days 60 days          
Trade Receivables | Credit risk | Investment grade counterparties | Minimum              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Percent of accounts receivable held with investment grade counterparties 96.00% 96.00%          
Foreign Exchange Contracts              
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]              
Fair value of derivative financial instruments net $ 1,000,000            
Notional value   $ 422