v3.20.1
Segment Disclosures and Related Information - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 6,158 $ 9,150
Natural Gas [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1,655 3,003
Natural Gas Liquids Reserves [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 151 238
Crude Oil [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 3,444 4,581
Other Products [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 908 1,328
U.S.    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 4,217 5,686
Australia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 437 559
Canada    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 333 573
China    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 146 243
Indonesia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 204 205
Libya    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 44 254
Malaysia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 216 336
Norway    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 446 588
United Kingdom    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 110 704
Other Non US Countries    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 5 2
Alaska [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1,113 1,407
Lower 48 [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 3,103 4,153
Lower 48 [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 3,093 4,141
Lower 48 [Member] | Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (10) (12)
Canada    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 513 823
Canada | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 333 573
Canada | Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (180) (250)
Europe and North Africa [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 600 1,546
Asia Pacific and Middle East [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1,003 1,343
Corporate and Other [Member] | Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 13 $ 140