v3.21.1
Segment Disclosures and Related Information - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 9,826 $ 6,158
Natural Gas [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 4,511 1,655
Natural Gas Liquids Reserves [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 237 151
Crude Oil [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 4,495 3,444
Other Products [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 583 908
U.S.    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 7,707 4,217
Australia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 0 437
Canada    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 562 333
China    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 155 146
Indonesia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 196 204
Libya    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 230 44
Malaysia    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 226 216
Norway    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 412 446
United Kingdom    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 336 110
Other Non US Countries    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 2 5
Alaska [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1,133 1,113
Lower 48 [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 6,513 3,103
Lower 48 [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 6,511 3,093
Lower 48 [Member] | Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (2) (10)
Canada [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 867 513
Canada [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 562 333
Canada [Member] | Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (305) (180)
Europe, Middle East And North Africa [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 978 600
Asia Pacific [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 577 1,003
Other International [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1 3
Corporate and Other [Member] | Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 64 $ 13