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Supplemental Information On Oil And Gas Operations (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
MBbls / d
MMBoe
$ / bbl
$ / Mcf
Dec. 31, 2016
USD ($)
MMBoe
Dec. 31, 2015
USD ($)
MMBoe
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2014
MMBoe
Reserve Quantities [Line Items]              
Production support costs | $   $ 168 $ 224        
Estimated future production support costs | $   $ 2,800 $ 2,700        
Percentage of production support costs in proportion to oil, gas and NGL sales   4.00% 4.00%        
Proved undeveloped reserves as a percentage of total proved reserves 19.00%            
Proved developed and undeveloped reserves, extensions and discoveries [1] 237 126 118        
Proved undeveloped reserves, conversion to proved developed reserves (MMBoe) 73            
Proved undeveloped reserves to proved developed reserves, conversion, percentage 18.00%            
Cost incurred related to development and conversion of proved undeveloped reserves | $ $ 237            
Proved undeveloped reserves [1] 410 409 376       689
Proved developed and undeveloped reserves, revisions due to prices [1] 73 (27) (302)        
Proved developed and undeveloped reserves, extensions and discoveries related to additions from infill drilling activities (MMBoe) 66 74 13        
Average estimated future realized price per barrel of oil used to estimate future cash inflows for proved oil reserves | $ / bbl 47.86            
Average estimated future realized price per barrel of bitumen used to estimate future cash inflows for proved bitumen reserves | $ / bbl 31.86            
Average estimated future realized price per Mcf of gas used to estimate future cash inflows for proved gas reserves | $ / Mcf 2.43            
Average estimated future realized price per barrel of natural gas liquids used to estimate future cash inflows for proved NGL reserves | $ / bbl 16.25            
Future development costs | $ $ 5,169 $ 4,985 $ 6,065        
Future dismantlement, abandonment and rehabilitation costs | $ $ 1,300            
Forecasted [Member]              
Reserve Quantities [Line Items]              
Future development costs | $       $ 500 $ 800 $ 900  
STACK and Delaware Basin [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries 128            
Percentage of additions to proved developed and undeveloped reserves for extensions and discoveries 80.00%            
Jackfish [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries     11        
Proved undeveloped reserves 209 294          
Daily barrel facility capacity (MBbls/d) | MBbls / d 35            
Year development schedule will be complete Dec. 31, 2028            
Proved undeveloped reserves, remaining undeveloped 5 years or more after initial booking (energy) 196            
Proved undeveloped reserve, requiring excess of five years to develop 88            
Proved developed and undeveloped reserves, extensions and discoveries related to additions from infill drilling activities (MMBoe)     11        
US [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries [1] 221 124 104        
Proved undeveloped reserves, conversion to proved developed reserves (MMBoe) 9            
Proved undeveloped reserves [1] 201 115 75       305
Proved developed and undeveloped reserves, revisions due to prices [1] 111 (48) (408)        
Future development costs | $ $ 3,316 $ 2,784 $ 3,306        
Canada [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries [1] 16 2 14        
Proved undeveloped reserves, conversion to proved developed reserves (MMBoe) 64            
Proved undeveloped reserves [1] 209 294 301       384
Proved developed and undeveloped reserves, revisions due to prices [1] (38) 21 106        
Future development costs | $ $ 1,853 $ 2,201 $ 2,759        
Delaware Basin [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries 79 18 38        
STACK [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries 120 97          
Proved developed and undeveloped reserves, extensions and discoveries related to additions from infill drilling activities (MMBoe)   73          
Eagle Ford [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries   7 21        
Anadarko Basin [Member]              
Reserve Quantities [Line Items]              
Proved developed and undeveloped reserves, extensions and discoveries     30        
Oil and Gas Properties [Member]              
Reserve Quantities [Line Items]              
Capitalized interest costs | $ $ 69 $ 61 $ 52        
[1] Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. This rate is not necessarily indicative of the relationship of natural gas and oil prices. Bitumen and NGL reserves are converted to Boe on a one-to-one basis with oil.