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Segment Information - Selected Financial Information for Anadarko's Reporting Segments Table (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Sales revenues $ 3,528 $ 3,414 $ 6,866 $ 6,650  
Other 80 71 177 114  
Total revenues and other 3,442 3,291 6,660 6,336  
Operating costs and expenses 3,657 2,472 6,041 4,966  
Net cash from settlement of commodity derivatives     (2) 234  
Other (income) expense, net 18 4 24 (8)  
Net income (loss) attributable to noncontrolling interests 80 (12) 191 41  
Total expenses and other 1,447 1,409 2,794 2,835  
Consolidated Adjusted EBITDAX 1,990 1,831 3,863 3,480  
Net properties and equipment 29,091   29,091   $ 28,615
Capital expenditures     2,553   6,185
Goodwill 4,789   4,789   4,789
(Gains) losses on derivatives, net [Member] | Commodity Contract [Member]          
Segment Reporting Information [Line Items]          
Net cash from settlement of commodity derivatives 0 170 (6) 238  
Gathering, processing, and marketing sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Segment Reporting Information [Line Items]          
Total (gains) losses on derivatives, net included in marketing revenue, less net cash from settlement 1 1 (2) 7  
Excluding Gains Losses On Divestitures Net [Member]          
Segment Reporting Information [Line Items]          
Total revenues and other 3,436 3,239 6,659 6,308  
Excluding Certain Items [Member]          
Segment Reporting Information [Line Items]          
Operating costs and expenses 1,364 1,247 2,604 2,564  
Excluding Certain Other Nonoperating Items [Member]          
Segment Reporting Information [Line Items]          
Other (income) expense, net 3 4 5 (8)  
Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 0 0 0 0  
Operating Segments [Member] | Exploration & Production [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 2,904 2,790 5,570 5,459  
Other (4) 3 4 (6)  
Total revenues and other 2,894 2,841 5,559 5,465  
Net income (loss) attributable to noncontrolling interests 0 0 0 0  
Total expenses and other 987 900 1,979 1,770  
Consolidated Adjusted EBITDAX 1,901 1,889 3,574 3,676  
Net properties and equipment 18,306   18,306   18,276
Capital expenditures     1,879   4,103
Goodwill 4,343   4,343   4,343
Operating Segments [Member] | Exploration & Production [Member] | (Gains) losses on derivatives, net [Member] | Commodity Contract [Member]          
Segment Reporting Information [Line Items]          
Net cash from settlement of commodity derivatives 0 0 0 0  
Operating Segments [Member] | Exploration & Production [Member] | Gathering, processing, and marketing sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Segment Reporting Information [Line Items]          
Total (gains) losses on derivatives, net included in marketing revenue, less net cash from settlement 0 0 0 0  
Operating Segments [Member] | Exploration & Production [Member] | Excluding Gains Losses On Divestitures Net [Member]          
Segment Reporting Information [Line Items]          
Total revenues and other 2,888 2,789 5,553 5,446  
Operating Segments [Member] | Exploration & Production [Member] | Excluding Certain Items [Member]          
Segment Reporting Information [Line Items]          
Operating costs and expenses 987 900 1,979 1,770  
Operating Segments [Member] | Exploration & Production [Member] | Excluding Certain Other Nonoperating Items [Member]          
Segment Reporting Information [Line Items]          
Other (income) expense, net 0 0 0 0  
Operating Segments [Member] | WES Midstream [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 685 519 1,357 1,021  
Other 70 39 132 80  
Total revenues and other 755 558 1,489 1,100  
Net income (loss) attributable to noncontrolling interests 0 0 0 0  
Total expenses and other 322 246 628 476  
Consolidated Adjusted EBITDAX 433 311 861 623  
Net properties and equipment 8,794   8,794   8,410
Capital expenditures     571   1,912
Goodwill 446   446   446
Operating Segments [Member] | WES Midstream [Member] | (Gains) losses on derivatives, net [Member] | Commodity Contract [Member]          
Segment Reporting Information [Line Items]          
Net cash from settlement of commodity derivatives 0 0 0 0  
Operating Segments [Member] | WES Midstream [Member] | Gathering, processing, and marketing sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Segment Reporting Information [Line Items]          
Total (gains) losses on derivatives, net included in marketing revenue, less net cash from settlement 0 0 0 0  
Operating Segments [Member] | WES Midstream [Member] | Excluding Gains Losses On Divestitures Net [Member]          
Segment Reporting Information [Line Items]          
Total revenues and other 755 557 1,489 1,099  
Operating Segments [Member] | WES Midstream [Member] | Excluding Certain Items [Member]          
Segment Reporting Information [Line Items]          
Operating costs and expenses 381 246 723 476  
Operating Segments [Member] | WES Midstream [Member] | Excluding Certain Other Nonoperating Items [Member]          
Segment Reporting Information [Line Items]          
Other (income) expense, net (59) 0 (95) 0  
Operating Segments [Member] | WES Midstream, Capitalized Cost incurred prior to sale of Midstream Assets [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures     49   734
Other and Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Sales revenues (61) 105 (61) 170  
Other 14 29 41 40  
Total revenues and other (207) (108) (388) (229)  
Net income (loss) attributable to noncontrolling interests 80 (12) 191 41  
Total expenses and other 138 263 187 589  
Consolidated Adjusted EBITDAX (344) (369) (572) (819)  
Net properties and equipment 1,991   1,991   1,929
Capital expenditures     103   170
Goodwill 0   0   $ 0
Other and Intersegment Eliminations [Member] | (Gains) losses on derivatives, net [Member] | Commodity Contract [Member]          
Segment Reporting Information [Line Items]          
Net cash from settlement of commodity derivatives 0 170 (6) 238  
Other and Intersegment Eliminations [Member] | Gathering, processing, and marketing sales [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]          
Segment Reporting Information [Line Items]          
Total (gains) losses on derivatives, net included in marketing revenue, less net cash from settlement 1 1 (2) 7  
Other and Intersegment Eliminations [Member] | Excluding Gains Losses On Divestitures Net [Member]          
Segment Reporting Information [Line Items]          
Total revenues and other (207) (107) (383) (237)  
Other and Intersegment Eliminations [Member] | Excluding Certain Items [Member]          
Segment Reporting Information [Line Items]          
Operating costs and expenses (4) 101 (98) 318  
Other and Intersegment Eliminations [Member] | Excluding Certain Other Nonoperating Items [Member]          
Segment Reporting Information [Line Items]          
Other (income) expense, net 62 4 100 (8)  
Oil and Gas [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 3,356 3,168 6,482 6,194  
Oil and Gas [Member] | Operating Segments [Member] | Exploration & Production [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 2,852 2,772 5,458 5,428  
Oil and Gas [Member] | Operating Segments [Member] | Exploration & Production [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 40 14 91 24  
Oil and Gas [Member] | Operating Segments [Member] | WES Midstream [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 492 358 992 706  
Oil and Gas [Member] | Operating Segments [Member] | WES Midstream [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 193 160 365 313  
Oil and Gas [Member] | Other and Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Sales revenues 12 38 32 60  
Oil and Gas [Member] | Other and Intersegment Eliminations [Member] | Intersegment Revenues [Member]          
Segment Reporting Information [Line Items]          
Sales revenues $ (233) $ (174) $ (456) $ (337)