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Supplementary Oil And Gas Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Extractive Industries [Abstract]  
Schedule of Twelve Month Average Benchmark Prices The Company has used the following 12-month average benchmark prices to determine its 2020 and 2019 reserves for SEC requirements.
Crude Oil and NGLs      
Natural Gas
WTI Cushing Oklahoma WCSCanadian Light SweetCromer LSBNorth Sea BrentEdmonton C5+Henry Hub LouisianaAECOBC Westcoast Station 2
(US$/bbl)(C$/bbl)(C$/bbl)(C$/bbl)(US$/bbl)(C$/bbl)(US$/MMBtu)(C$/MMBtu)(C$/MMBtu)
2020:
39.77 34.84 45.02 45.55 43.43 50.41 2.162.17 2.10 
2019:
55.73 57.29 66.77 66.85 62.54 68.71 2.542.02 1.13 
Schedule of Crude Oil, NGL's and Natural Gas Net Proved Reserve Quantities
The following tables summarize the Company's proved and proved developed crude oil and natural gas reserves, net of royalties, as at December 31, 2020, 2019, 2018 and 2017:
 North America 
Crude Oil and NGLs (MMbbl)(1)
Synthetic
Crude Oil
Bitumen(2)
Crude
Oil & NGLs
North
America
Total
North
 Sea
Offshore
Africa
Total
Net Proved Reserves
       
Reserves, December 31, 2017
4,956 1,365 594 6,915 107 69 7,091 
Extensions and discoveries
744 151 17 912 — — 912 
Improved recovery
— 10 50 60 1 3 64 
Purchases of reserves in place
— 2 7 9 7 — 16 
Sales of reserves in place
— (4)— (4)— — (4)
Production
(148)(64)(47)(259)(9)(6)(274)
Economic revisions due to prices
— (45)(18)(63)11 1 (51)
Revisions of prior estimates
109 54 1 164 (3)4 165 
Reserves, December 31, 2018
5,661 1,469 604 7,734 114 71 7,919 
Extensions and discoveries
334 18 12 364 — — 364 
Improved recovery
— 169 12 181 — — 181 
Purchases of reserves in place
— 666 2 668 — — 668 
Sales of reserves in place
— — — — — — — 
Production
(137)(81)(49)(267)(10)(7)(285)
Economic revisions due to prices(3)
(288)3 — (285)(1)1 (285)
Revisions of prior estimates(17)(27)17 (28)3 6 (19)
Reserves, December 31, 20195,554 2,216 598 8,368 105 70 8,544 
Extensions and discoveries
708 8 10 726 — — 726 
Improved recovery
— 49 9 58 — — 58 
Purchases of reserves in place
— — 28 28 — — 28 
Sales of reserves in place
— — — — — — — 
Production
(151)(109)(45)(305)(8)(6)(320)
Economic revisions due to prices(4)
701 207 (94)814 (12)3 805 
Revisions of prior estimates
36 41 20 97 3 4 103 
Reserves, December 31, 2020
6,847 2,413 525 9,785 87 71 9,943 
Net proved developed reserves
       
December 31, 2017
4,967 410 399 5,776 28 21 5,825 
December 31, 20185,661 461 378 6,500 37 34 6,571 
December 31, 2019
5,452 661 354 6,466 38 39 6,543 
December 31, 2020
6,770 628 285 7,682 32 37 7,751 
(1)Information in the reserves data tables may not add due to rounding.
(2)Bitumen as defined by the SEC, "is petroleum in a solid or semi-solid state in natural deposits with a viscosity greater than 10,000 centipoise measured at original temperature in the deposit and atmospheric pressure, on a gas free basis." Under this definition, all the Company's thermal and primary heavy crude oil reserves have been classified as bitumen.
(3)Reflects the impact of increased royalties at Oil Sands Mining and Upgrading (SCO) due to higher bitumen pricing resulting in higher royalties and lower net reserves.
(4)Reflects the impact of decreased royalties at Oil Sands Mining and Upgrading (SCO) and thermal Bitumen due to lower bitumen pricing resulting in lower royalties and higher net reserves.
Natural Gas (Bcf)(1)
North
 America
North
 Sea
Offshore
 Africa
Total
Net Proved Reserves
 
 
 
Reserves, December 31, 2017
5,199 25 16 5,240 
Extensions and discoveries
90 — — 90 
Improved recovery
414 — — 414 
Purchases of reserves in place
67 — — 67 
Sales of reserves in place
(3)— — (3)
Production
(523)(11)(8)(542)
Economic revisions due to prices
(746)— (2)(748)
Revisions of prior estimates
(192)13 15 (164)
Reserves, December 31, 2018
4,306 27 21 4,354 
Extensions and discoveries
106 — — 106 
Improved recovery
202 — — 202 
Purchases of reserves in place
34 — — 34 
Sales of reserves in place
— — — — 
Production
(511)(9)(8)(528)
Economic revisions due to prices
246 — 2 248 
Revisions of prior estimates
346 (2)23 367 
Reserves, December 31, 2019
4,728 16 38 4,782 
Extensions and discoveries
173 — — 173 
Improved recovery
159 — — 159 
Purchases of reserves in place
2,614 — — 2,615 
Sales of reserves in place
(4)— — (4)
Production
(515)(4)(5)(524)
Economic revisions due to prices
97 — 4 100 
Revisions of prior estimates
402 — (3)399 
Reserves, December 31, 2020
7,655 12 34 7,701 
Net proved developed reserves
 
 
 
 
December 31, 2017
3,081 22 9 3,112 
December 31, 20182,382 23 12 2,417 
December 31, 20192,342 11 28 2,381 
December 31, 20203,116 6 22 3,144 
(1)Information in the reserves data tables may not add due to rounding.
Schedule of Capitalized Costs Relating To Oil And Gas Producing Activities Disclosure
Capitalized Costs Related to Crude Oil and Natural Gas Activities
 2020
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Proved properties
$119,707 $7,283 $3,963 $130,953 
Unproved properties
2,353 — 83 2,436 
 
122,060 7,283 4,046 133,389 
Less: accumulated depletion and depreciation
(56,930)(5,853)(2,822)(65,605)
Net capitalized costs
$65,130 $1,430 $1,224 $67,784 

 
 
2019
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Proved properties
$117,643 $7,296 $3,933 $128,872 
Unproved properties
2,510 — 69 2,579 
 
120,153 7,296 4,002 131,451 
Less: accumulated depletion and depreciation
(52,824)(5,712)(2,712)(61,248)
Net capitalized costs
$67,329 $1,584 $1,290 $70,203 

 
 
2018
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Proved properties
$110,154 $7,321 $5,471 $122,946 
Unproved properties
2,600 — 37 2,637 
 
112,754 7,321 5,508 125,583 
Less: accumulated depletion and depreciation
(48,862)(5,735)(4,203)(58,800)
Net capitalized costs
$63,892 $1,586 $1,305 $66,783 
Disclosure of Detailed Information About Costs Incurred In Crude Oil And Natural Gas Activities
Costs Incurred in Crude Oil and Natural Gas Activities
 2020
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Property acquisitions
 
 
 
 
Proved
$750 $— $— $750 
Unproved
15 — — 15 
Exploration
22 — 15 37 
Development
2,338 104 94 2,536 
Costs incurred
$3,125 $104 $109 $3,338 
 

 
2019
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Property acquisitions
 
 
 
 
Proved
$3,405 $— $— $3,405 
Unproved
91 — — 91 
Exploration
38 — 33 71 
Development
4,687 349 233 5,269 
Costs incurred
$8,221 $349 $266 $8,836 
 

 
2018
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Property acquisitions
 
 
 
 
Proved
$214 $127 $— $341 
Unproved
340 — (89)251 
Exploration
116 — 35 151 
Development
3,245 110 212 3,567 
Costs incurred
$3,915 $237 $158 $4,310 
Disclosure Of Detailed Information About Results Of Operations From Crude Oil And Natural Gas Activities
Results of Operations from Crude Oil and Natural Gas Producing Activities
The Company's results of operations from crude oil and natural gas producing activities for the years ended December 31, 2020, 2019 and 2018 are summarized in the following tables:

 2020
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Crude oil and natural gas revenue, net of royalties,
blending and feedstock costs
$12,520 $432 $354 $13,306 
Production
(5,624)(321)(103)(6,048)
Transportation
(1,258)(15)(1)(1,274)
Depletion, depreciation and amortization
(5,564)(277)(190)(6,031)
Asset retirement obligation accretion
(169)(30)(6)(205)
Petroleum revenue tax
— 31 — 31 
Income tax
23 72 (13)82 
Results of operations$(72)$(108)$41 $(139)

 2019
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Crude oil and natural gas revenue, net of royalties,
blending and feedstock costs
$17,348 $920 $676 $18,944 
Production
(5,701)(391)(109)(6,201)
Transportation
(968)(19)(2)(989)
Depletion, depreciation and amortization
(4,982)(308)(242)(5,532)
Asset retirement obligation accretion
(156)(28)(6)(190)
Petroleum revenue tax
— 88 — 88 
Income tax
(1,468)(105)(79)(1,652)
Results of operations
$4,073 $157 $238 $4,468 
 

 
2018
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Crude oil and natural gas revenue, net of royalties,
blending and feedstock costs
$16,065 $891 $647 $17,603 
Production
(5,772)(405)(208)(6,385)
Transportation
(929)(22)(2)(953)
Depletion, depreciation and amortization
(4,689)(257)(201)(5,147)
Asset retirement obligation accretion
(148)(29)(9)(186)
Petroleum revenue tax
— 12 — 12 
Income tax
(1,223)(76)(51)(1,350)
Results of operations
$3,304 $114 $176 $3,594 
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure The following tables summarize the Company's future net cash flows relating to proved crude oil and natural gas reserves based on the standardized measure as prescribed in FASB Topic 932 - "Extractive Activities - Oil and Gas":
 
2020
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Future cash inflows
$404,193 $5,873 $4,172 $414,238 
Future production costs
(203,599)(3,259)(1,746)(208,604)
Future development costs and asset retirement obligations
(72,935)(2,130)(1,032)(76,097)
Future income taxes
(27,178)(141)(217)(27,536)
Future net cash flows
100,481 343 1,177 102,001 
10% annual discount for timing of future cash flows(1)
(74,395)278 (373)(74,490)
Standardized measure of future net cash flows$26,086 $621 $804 $27,511 
(1)Includes the impact of abandonment expenditures timing.
 2019
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Future cash inflows
$515,864 $10,030 $5,858 $531,752 
Future production costs
(194,076)(4,893)(2,081)(201,050)
Future development costs and asset retirement obligations
(70,879)(2,648)(1,076)(74,603)
Future income taxes
(53,759)(936)(547)(55,242)
Future net cash flows
197,150 1,553 2,154 200,857 
10% annual discount for timing of future cash flows
(136,616)(1)(715)(137,332)
Standardized measure of future net cash flows
$60,534 $1,552 $1,439 $63,525 
 
 
2018
(millions of Canadian dollars)
North
 America
North
 Sea
Offshore
 Africa
Total
Future cash inflows
$500,557 $12,002 $6,447 $519,006 
Future production costs
(193,387)(5,148)(2,284)(200,819)
Future development costs and asset retirement obligations
(63,202)(2,909)(1,099)(67,210)
Future income taxes
(60,526)(1,484)(626)(62,636)
Future net cash flows
183,442 2,461 2,438 188,341 
10% annual discount for timing of future cash flows
(126,699)(545)(771)(128,015)
Standardized measure of future net cash flows
$56,743 $1,916 $1,667 $60,326 
Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows
The principal sources of change in the standardized measure of discounted future net cash flows are summarized in the following table:
(millions of Canadian dollars)
202020192018
Sales of crude oil and natural gas produced, net of production costs
$(6,127)$(11,807)$(10,229)
Net changes in sales prices and production costs
(46,055)(3,515)20,386 
Extensions, discoveries and improved recovery
626 5,883 2,807 
Changes in estimated future development costs
(153)(1,889)(698)
Purchases of proved reserves in place
947 7,418 396 
Sales of proved reserves in place
(1)— (55)
Revisions of previous reserve estimates
5,295 (3,384)2,711 
Accretion of discount
7,718 8,062 6,119 
Changes in production timing and other
(4,830)447 (955)
Net change in income taxes
6,566 1,984 (7,061)
Net change
(36,014)3,199 13,421 
Balance - beginning of year
63,525 60,326 46,905 
Balance - end of year
$27,511 $63,525 $60,326