v3.19.3.a.u2
Segment Disclosures - Analysis of Results by Operating Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue [1] $ 32,567,000,000 $ 36,417,000,000 $ 29,106,000,000
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 221,000,000 168,000,000 104,000,000
Alaska Segment [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 5,483,000,000 5,740,000,000 4,224,000,000
Lower 48 Segment [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 15,514,000,000 17,029,000,000 12,968,000,000
Lower 48 Segment [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 15,468,000,000 16,989,000,000 12,964,000,000
Lower 48 Segment [Member] | Intersegment Elimination [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue (46,000,000) (40,000,000) (4,000,000)
Canada Segment [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 2,910,000,000 3,184,000,000 3,178,000,000
Canada Segment [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 1,769,000,000 2,024,000,000 2,619,000,000
Canada Segment [Member] | Intersegment Elimination [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue (1,141,000,000) (1,160,000,000) (559,000,000)
Europe and North Africa Segment [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 5,101,000,000 6,635,000,000 5,181,000,000
Asia Pacific and Middle East [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue 4,525,000,000 4,861,000,000 4,014,000,000
Other International Segment [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenue $ 0 $ 0 $ 0
[1] <div>(1)Sales and other operating revenues are attributable to countries based on the location of the selling operation.</div>