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v3.20.4

Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | $ 27,834 | $ 28,698
Ending Balance | 25,411 | 27,834
Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 36,356 | 35,224
Adjustment for Change in Accounting Policy |  | (4)
Additions | 811 | 1,116
Transfers From E&E Assets (Note 17) | 47 |
Change in Decommissioning Liabilities | (6) | 354
Exchange Rate Movements and Other | (159) | (294)
Divestitures | (3) | (40)
Ending Balance | 37,046 | 36,356
Accumulated Depreciation, Depletion and Amortization [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 8,522 | 6,526
Adjustment for Change in Accounting Policy |  | (1)
Depreciation, Depletion and Amortization | 2,119 | 2,051
Impairment Charges | 1,109 | 30
Exchange Rate Movements and Other | (115) | (55)
Divestitures |  | (29)
Ending Balance | 11,635 | 8,522
Development & Production Upstream Assets [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 23,357 | 24,128
Ending Balance | 21,465 | 23,357
Development & Production Upstream Assets [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 29,032 | 28,046
Additions | 475 | 695
Transfers From E&E Assets (Note 17) | 6 |
Change in Decommissioning Liabilities | (11) | 340
Exchange Rate Movements and Other | (6) | (9)
Divestitures | (3) | (40)
Ending Balance | 29,493 | 29,032
Development & Production Upstream Assets [Member] | Accumulated Depreciation, Depletion and Amortization [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 5,675 | 3,918
Depreciation, Depletion and Amortization | 1,768 | 1,735
Impairment Charges | 607 | 20
Exchange Rate Movements and Other | (22) | 31
Divestitures |  | (29)
Ending Balance | 8,028 | 5,675
Other Upstream Assets [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Ending Balance | 41 |
Other Upstream Assets [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 333 | 333
Transfers From E&E Assets (Note 17) | 41 |
Ending Balance | 374 | 333
Other Upstream Assets [Member] | Accumulated Depreciation, Depletion and Amortization [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 333 | 333
Ending Balance | 333 | 333
Refining Equipment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 3,981 | 4,190
Ending Balance | 3,476 | 3,981
Refining Equipment [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 5,577 | 5,632
Adjustment for Change in Accounting Policy |  | (4)
Additions | 243 | 228
Change in Decommissioning Liabilities | 3 | 9
Exchange Rate Movements and Other | (152) | (288)
Ending Balance | 5,671 | 5,577
Refining Equipment [Member] | Accumulated Depreciation, Depletion and Amortization [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 1,596 | 1,442
Adjustment for Change in Accounting Policy |  | (1)
Depreciation, Depletion and Amortization | 242 | 241
Impairment Charges | 450 |
Exchange Rate Movements and Other | (93) | (86)
Ending Balance | 2,195 | 1,596
Other [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 496 | 380
Ending Balance | 429 | 496
Other [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 1,414 | 1,213
Additions | 93 | 193
Change in Decommissioning Liabilities | 2 | 5
Exchange Rate Movements and Other | (1) | 3
Ending Balance | 1,508 | 1,414
Other [Member] | Accumulated Depreciation, Depletion and Amortization [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Beginning Balance | 918 | 833
Depreciation, Depletion and Amortization | 109 | 75
Impairment Charges | 52 | 10
Ending Balance | $ 1,079 | $ 918

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