Revenue - Summary of Revenue from Contracts with Customers on a Disaggregated Basis (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | $ 1,671 | $ 1,581 | $ 3,228 | $ 2,961 |
Other operating revenues (a) | (11) | (47) | 4 | (81) |
Total sales and other operating revenues | 1,660 | 1,534 | 3,232 | 2,880 |
Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Crude Oil Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 967 | 849 | 1,777 | 1,617 |
Natural Gas Liquids Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 48 | 75 | 116 | 146 |
Natural Gas Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 195 | 211 | 426 | 389 |
Sales of Purchased Oil and Gas | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 461 | 446 | 909 | 809 |
Operating Segments | Exploration and Production | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 1,671 | 1,581 | 3,228 | 2,961 |
Other operating revenues (a) | (11) | (47) | 4 | (81) |
Total sales and other operating revenues | 1,660 | 1,534 | 3,232 | 2,880 |
Operating Segments | Exploration and Production | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | United States | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 1,282 | 1,228 | 2,500 | 2,256 |
Other operating revenues (a) | (11) | (47) | 4 | (81) |
Total sales and other operating revenues | 1,271 | 1,181 | 2,504 | 2,175 |
Operating Segments | Exploration and Production | United States | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Denmark | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 53 | 21 | 72 | 57 |
Other operating revenues (a) | 0 | 0 | 0 | 0 |
Total sales and other operating revenues | 53 | 21 | 72 | 57 |
Operating Segments | Exploration and Production | Denmark | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Libya | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 158 | 139 | 277 | 270 |
Other operating revenues (a) | 0 | 0 | 0 | 0 |
Total sales and other operating revenues | 158 | 139 | 277 | 270 |
Operating Segments | Exploration and Production | Libya | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Malaysia & JDA | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 178 | 193 | 379 | 378 |
Other operating revenues (a) | 0 | 0 | 0 | 0 |
Total sales and other operating revenues | 178 | 193 | 379 | 378 |
Operating Segments | Exploration and Production | Malaysia & JDA | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Crude Oil Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 967 | 849 | 1,777 | 1,617 |
Operating Segments | Exploration and Production | Crude Oil Revenue | United States | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 762 | 692 | 1,444 | 1,285 |
Operating Segments | Exploration and Production | Crude Oil Revenue | Denmark | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 51 | 19 | 67 | 52 |
Operating Segments | Exploration and Production | Crude Oil Revenue | Libya | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 130 | 110 | 221 | 209 |
Operating Segments | Exploration and Production | Crude Oil Revenue | Malaysia & JDA | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 24 | 28 | 45 | 71 |
Operating Segments | Exploration and Production | Natural Gas Liquids Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 48 | 75 | 116 | 146 |
Operating Segments | Exploration and Production | Natural Gas Liquids Revenue | United States | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 48 | 75 | 116 | 146 |
Operating Segments | Exploration and Production | Natural Gas Liquids Revenue | Denmark | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Natural Gas Liquids Revenue | Libya | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Natural Gas Liquids Revenue | Malaysia & JDA | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Natural Gas Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 195 | 211 | 426 | 389 |
Operating Segments | Exploration and Production | Natural Gas Revenue | United States | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 33 | 37 | 75 | 76 |
Operating Segments | Exploration and Production | Natural Gas Revenue | Denmark | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 2 | 2 | 5 | 5 |
Operating Segments | Exploration and Production | Natural Gas Revenue | Libya | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 6 | 7 | 12 | 15 |
Operating Segments | Exploration and Production | Natural Gas Revenue | Malaysia & JDA | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 154 | 165 | 334 | 293 |
Operating Segments | Exploration and Production | Sales of Purchased Oil and Gas | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 461 | 446 | 909 | 809 |
Operating Segments | Exploration and Production | Sales of Purchased Oil and Gas | United States | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 439 | 424 | 865 | 749 |
Operating Segments | Exploration and Production | Sales of Purchased Oil and Gas | Denmark | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Exploration and Production | Sales of Purchased Oil and Gas | Libya | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 22 | 22 | 44 | 46 |
Operating Segments | Exploration and Production | Sales of Purchased Oil and Gas | Malaysia & JDA | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 14 |
Operating Segments | Midstream | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 190 | 176 | 380 | 343 |
Other operating revenues (a) | 0 | 0 | 0 | 0 |
Total sales and other operating revenues | 190 | 176 | 380 | 343 |
Operating Segments | Midstream | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 190 | 176 | 380 | 343 |
Operating Segments | Midstream | Crude Oil Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Midstream | Natural Gas Liquids Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Midstream | Natural Gas Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Midstream | Sales of Purchased Oil and Gas | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Eliminations | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | (190) | (176) | (380) | (343) |
Other operating revenues (a) | 0 | 0 | 0 | 0 |
Total sales and other operating revenues | (190) | (176) | (380) | (343) |
Eliminations | Intercompany Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | (190) | (176) | (380) | (343) |
Eliminations | Crude Oil Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Eliminations | Natural Gas Liquids Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Eliminations | Natural Gas Revenue | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | 0 | 0 | 0 | 0 |
Eliminations | Sales of Purchased Oil and Gas | | | | |
Disaggregation Of Revenue [Line Items] | | | | |
Total revenues from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0 |