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Financial and derivative instruments (Tables)
 3 Months Ended
Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
The net notional long/(short) position of derivative instruments was:
 
As at
Mar 31
As at Dec 31
thousands of barrels20242023
Crude(3,950)(4,450)
Products(2,060)(490)
Derivative Instruments, Gain (Loss)
Realized and unrealized gain/(loss) on derivative instruments recognized in the Consolidated statement of income is included in the following lines on a before-tax basis:
 
    Three Months
    to March 31
millions of Canadian dollars2024 2023 
Revenues(24)(23)
Summary of estimated fair value of financial instruments
The estimated fair value of derivative instruments, and the related hierarchy level for the fair value measurement were as follows:
At March 31, 2024
millions of Canadian dollars
Fair valueEffect of
counterparty
netting		Effect of
collateral
netting 		Net
carrying
value
Level 1Level 2Level 3Total
Assets
Derivative assets (a)
50 27 — 77 (50)— 27 
Liabilities
Derivative liabilities (b)
54 60 — 114 (50)(4)60 
(a)Included in the Consolidated balance sheet line: “Materials, supplies and prepaid expenses”, “Accounts receivable - net” and “Other assets, including intangibles - net”.
(b)Included in the Consolidated balance sheet line: “Accounts payable and accrued liabilities” and “Other long-term obligations”.
At December 31, 2023
millions of Canadian dollars
Fair valueEffect of
counterparty
netting		Effect of
collateral
netting		Net
carrying
value
Level 1Level 2Level 3Total
Assets
Derivative assets (a)
28 18 — 46 (16)(12)18 
Liabilities
Derivative liabilities (b)
16 31 — 47 (16)— 31 
(a)Included in the Consolidated balance sheet line: “Materials, supplies and prepaid expenses”, “Accounts receivable - net” and “Other assets, including intangibles - net”.
(b)Included in the Consolidated balance sheet line: “Accounts payable and accrued liabilities” and “Other long-term obligations”.