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Description of Business and Segmented Disclosures - Schedule of Segment and Operational Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues              
Gross Sales $ 13,431 $ 3,812 $ 34,064 $ 10,022 $ 13,591 $ 21,353 $ 21,389
Less: Royalties 733 153 1,639 228 371 1,173 546
Revenue 12,698 3,659 32,425 9,794 13,220 20,180 20,843
Expenses              
Purchased Product 6,731 1,408 16,078 4,207 5,358 8,427 8,744
Transportation and Blending 1,923 1,033 5,504 3,591 4,728 5,184 5,942
Operating 1,150 481 3,428 1,470 1,955 2,088 2,184
(Gain) Loss on Risk Management 157 3 951 233      
Depreciation, Depletion and Amortization 1,153 1,092 3,234 2,615 3,464 2,249 2,131
Exploration Expense 5 25 15 32 91 82 2,123
(Income) Loss From Equity-Accounted Affiliates (13) 0 (40) 0      
Segment Income (Loss) 1,592 (383) 3,255 (2,354) (2,684) 1,994 (586)
General and Administrative 158 51 491 124 292 331 1,020
Finance Costs 360 145 836 391 536 511 627
Interest Income (4) (2) (11) (4) (9) (12) (19)
Integration Costs 45 0 302 0 29    
Foreign Exchange (Gain) Loss, Net 196 (159) (93) 168 (181) (404) 854
Re-measurement of Contingent Payment 135 (31) 571 (97) 80 (164) (50)
(Gain) Loss on Divestiture of Assets (25) (1) (97) 0 (81) (2) 795
Other (Income) Loss, Net (107) (14) (208) (52) 40 9 13
Total Non-operating (Income) Expense 758 (11) 1,791 530 546 597 3,340
Earnings (Loss) Before Income Tax 834 (372) 1,464 (2,884) (3,230) 1,397 (3,926)
Income Tax Expense (Recovery) 283 (178) 469 (658) (851) (797) (1,010)
Net Earnings (Loss) 551 (194) 995 (2,226) (2,379) 2,194 (2,916)
Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 184 138 725 226 252 7 1,554
Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management (27) (135) 226 7 56 149 (1,249)
Oil Sands | Upstream              
Revenues              
Gross Sales 6,114 2,436 15,904 6,117 8,481 12,739 11,975
Less: Royalties 669 129 1,462 200 331 1,143 473
Revenue 5,445 2,307 14,442 5,917 8,150 11,596 11,502
Expenses              
Purchased Product 822 235 2,114 806 939 1,869 1,933
Transportation and Blending 1,918 1,015 5,476 3,552 4,683 5,152 5,879
Operating 616 286 1,793 839 1,156 1,067 1,056
Operating Margin 1,923 634     1,104 3,485 1,083
Depreciation, Depletion and Amortization 743 470 1,982 1,276 1,687 1,543 1,439
Exploration Expense 2 0 15 7 9 18 6
(Income) Loss From Equity-Accounted Affiliates 0 0 (5) 0      
Segment Income (Loss) 1,217 299 2,289 (799) (649) 1,832 (193)
Oil Sands | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 166 137     268 23 1,551
Oil Sands | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management (39) (135)     57 92 (169)
Conventional | Upstream              
Revenues              
Gross Sales 833 232 2,235 636 904 935 1,071
Less: Royalties 40 24 103 28 40 30 73
Revenue 793 208 2,132 608 864 905 998
Expenses              
Purchased Product 445 76 1,113 184 268 240 168
Transportation and Blending 20 21 57 63 81 82 90
Operating 135 81 417 248 320 339 404
Operating Margin 191 30     195 244 310
Depreciation, Depletion and Amortization 99 75 309 563 880 319 412
Exploration Expense 0 25 (3) 25 82 64 2,117
(Income) Loss From Equity-Accounted Affiliates 0 0 0 0      
Segment Income (Loss) 83 (70) 227 (475) (767) (139) (2,219)
Conventional | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 2 0     0 0 26
Conventional | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 9 0     0 0 0
Offshore | Upstream              
Revenues              
Gross Sales 404 0 1,262 0 0 0 0
Less: Royalties 24 0 74 0 0 0 0
Revenue 380 0 1,188 0 0 0 0
Expenses              
Purchased Product 0 0 0 0 0 0 0
Transportation and Blending 3 0 10 0 0 0 0
Operating 49 0 166 0 0 0 0
Operating Margin 328 0     0 0 0
Depreciation, Depletion and Amortization 127 0 369 0 0 0 0
Exploration Expense 3 0 3 0 0 0 0
(Income) Loss From Equity-Accounted Affiliates (12) 0 (36) 0      
Segment Income (Loss) 210 0 676 0 0 0 0
Offshore | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0     0 0 0
Offshore | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0     0 0 0
Canadian Manufacturing | Upstream              
Expenses              
Operating Margin     4,475 492      
Canadian Manufacturing | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     584 228      
Canadian Manufacturing | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     194 8      
Canadian Manufacturing | Downstream              
Revenues              
Gross Sales 1,215 15 3,109 58 82 77 36
Less: Royalties 0 0 0 0 0 0 0
Revenue 1,215 15 3,109 58 82 77 36
Expenses              
Purchased Product 986 0 2,424 0 0 0 0
Transportation and Blending 0 0 0 0 0 0 0
Operating 99 8 284 29 37 41 37
Operating Margin 130 7 401 29 45 36 (1)
Depreciation, Depletion and Amortization 41 2 127 6 8 7 7
Exploration Expense 0 0 0 0 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0 0 0      
Segment Income (Loss) 89 5 274 23 37 29 (8)
Canadian Manufacturing | Downstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0 0 0 0 0 0
Canadian Manufacturing | Downstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0 0 0 0 0 0
U.S. Manufacturing | Upstream              
Expenses              
Operating Margin     543 113      
U.S. Manufacturing | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     2 0      
U.S. Manufacturing | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     10 0      
U.S. Manufacturing | Downstream              
Revenues              
Gross Sales 5,723 1,237 13,889 3,633 4,733 8,291 9,031
Less: Royalties 0 0 0 0 0 0 0
Revenue 5,723 1,237 13,889 3,633 4,733 8,291 9,031
Expenses              
Purchased Product 5,171 1,133 12,320 3,413 4,429 6,735 7,160
Transportation and Blending 0 0 0 0 0 0 0
Operating 413 179 1,212 564 748 877 870
Operating Margin 122 (77) 309 (338) (423) 695 1,002
Depreciation, Depletion and Amortization 103 518 320 666 728 273 215
Exploration Expense 0 0 0 0 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0 0 0      
Segment Income (Loss) 14 (592) (49) (1,003) (1,150) 421 792
U.S. Manufacturing | Downstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 17 2 48 (6) (21) (16) (1)
U.S. Manufacturing | Downstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 5 (3) 38 (1) (1) 1 (5)
Retail | Upstream              
Expenses              
Operating Margin     1,012 0      
Retail | Upstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     0 0      
Retail | Upstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management     0 0      
Retail | Downstream              
Revenues              
Gross Sales 592 0 1,540 0 0 0 0
Less: Royalties 0 0 0 0 0 0 0
Revenue 592 0 1,540 0 0 0 0
Expenses              
Purchased Product 551 0 1,434 0 0 0 0
Transportation and Blending 0 0 0 0 0 0 0
Operating 25 0 73 0 0 0 0
Operating Margin 16 0 33 0 0 0 0
Depreciation, Depletion and Amortization 11 0 36 0 0 0 0
Exploration Expense 0 0 0 0 0 0 0
(Income) Loss From Equity-Accounted Affiliates 0 0 0 0      
Segment Income (Loss) 5 0 (3) 0 0 0 0
Retail | Downstream | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0 0 0 0 0 0
Retail | Downstream | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management 0 0 0 0 0 0 0
Corporate and Eliminations              
Revenues              
Gross Sales (1,450) (108) (3,875) (422) (609) (689) (724)
Less: Royalties 0 0 0 0 0 0 0
Revenue (1,450) (108) (3,875) (422) (609) (689) (724)
Expenses              
Purchased Product (1,244) (36) (3,327) (196) (278) (417) (517)
Transportation and Blending (18) (3) (39) (24) (36) (50) (27)
Operating (187) (73) (517) (210) (306) (236) (183)
Depreciation, Depletion and Amortization 29 27 91 104 161 107 58
Exploration Expense 0 0 0 0 0 0 0
(Income) Loss From Equity-Accounted Affiliates (1) 0 1 0      
Segment Income (Loss) (26) (25) (159) (100) (155) (149) 1,042
General and Administrative 158 51 491 124 292 331 1,020
Finance Costs 360 145 836 391 536 511 627
Interest Income (4) (2) (11) (4) (9) (12) (19)
Integration Costs 45 0 302 0 29    
Foreign Exchange (Gain) Loss, Net 196 (159) (93) 168 (181) (404) 854
Re-measurement of Contingent Payment 135 (31) 571 (97) 80 (164) (50)
(Gain) Loss on Divestiture of Assets (25) (1) (97) 0 (81) (2) 795
Other (Income) Loss, Net (107) (14) (208) (52) 40 9 13
Total Non-operating (Income) Expense 758 (11) 1,791 530 546 597 3,340
Corporate and Eliminations | Realized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management (1) (1) 91 4 5 0 (22)
Corporate and Eliminations | Unrealized (Gain) Loss              
Expenses              
(Gain) Loss on Risk Management $ (2) $ 3 $ (16) $ 0 $ 0 $ 56 $ (1,075)