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Segment Information - Selected Financial Information for Anadarko's Reporting Segments Table (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Sales Revenues $ 3,851   $ 10,501  
Other 87 $ 80 201 $ 237
Total revenues and other 3,697 2,496 10,033 8,979
Operating costs and expenses 2,718 3,245 7,684 9,895
Net cash from settlement of commodity derivatives     433 (21)
Other (income) expense, net 24 5 16 51
Net income (loss) attributable to noncontrolling interests 64 58 105 182
Total expenses and other 1,572 1,456 4,407 4,101
Consolidated Adjusted EBITDAX 2,122 1,234 5,602 4,061
(Gains) losses on derivatives, net [Member] | Commodity Contract [Member]        
Segment Reporting Information [Line Items]        
Net cash from settlement of commodity derivatives 199 (16) 437 (23)
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   7 (2)
Excluding Gains Losses On Divestitures Net [Member]        
Segment Reporting Information [Line Items]        
Total revenues and other [1] 3,694 2,690 10,002 8,164
Excluding Certain Items [Member]        
Segment Reporting Information [Line Items]        
Operating costs and expenses [2] 1,292 1,412 3,856 3,918
Excluding Certain Other Nonoperating Items [Member]        
Segment Reporting Information [Line Items]        
Other (income) expense, net 17 [3] 2 9 [3] 24
Operating Segments [Member] | Exploration and Production [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 3,195   8,654  
Other 1 6 (5) 16
Total revenues and other 3,192   8,657  
Net income (loss) attributable to noncontrolling interests 0 0 0 0
Total expenses and other 1,059 956 2,840 2,679
Consolidated Adjusted EBITDAX 2,128 1,151 5,793 3,847
Operating Segments [Member] | Exploration and 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 and 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
Operating Segments [Member] | Exploration and Production [Member] | Excluding Gains Losses On Divestitures Net [Member]        
Segment Reporting Information [Line Items]        
Total revenues and other [1] 3,187 2,107 8,633 6,526
Operating Segments [Member] | Exploration and Production [Member] | Excluding Certain Items [Member]        
Segment Reporting Information [Line Items]        
Operating costs and expenses [2] 1,059 956 2,840 2,679
Operating Segments [Member] | Exploration and Production [Member] | Excluding Certain Other Nonoperating Items [Member]        
Segment Reporting Information [Line Items]        
Other (income) expense, net 0 [3] 0 0 [3] 0
Operating Segments [Member] | WES Midstream [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 511   1,438  
Other 52 39 113 124
Total revenues and other 560   1,545  
Net income (loss) attributable to noncontrolling interests 0 0 0 0
Total expenses and other 245 345 687 936
Consolidated Adjusted EBITDAX 315 258 858 788
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
Operating Segments [Member] | WES Midstream [Member] | Excluding Gains Losses On Divestitures Net [Member]        
Segment Reporting Information [Line Items]        
Total revenues and other [1] 560 603 1,545 1,724
Operating Segments [Member] | WES Midstream [Member] | Excluding Certain Items [Member]        
Segment Reporting Information [Line Items]        
Operating costs and expenses [2] 245 345 687 936
Operating Segments [Member] | WES Midstream [Member] | Excluding Certain Other Nonoperating Items [Member]        
Segment Reporting Information [Line Items]        
Other (income) expense, net 0 [3] 0 0 [3] 0
Operating Segments [Member] | Other Midstream [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 113   255  
Other 11 7 30 20
Total revenues and other 129   301  
Net income (loss) attributable to noncontrolling interests 0 0 0 0
Total expenses and other 55 62 134 168
Consolidated Adjusted EBITDAX 73 41 157 111
Operating Segments [Member] | Other 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] | Other 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
Operating Segments [Member] | Other Midstream [Member] | Excluding Gains Losses On Divestitures Net [Member]        
Segment Reporting Information [Line Items]        
Total revenues and other [1] 128 103 291 279
Operating Segments [Member] | Other Midstream [Member] | Excluding Certain Items [Member]        
Segment Reporting Information [Line Items]        
Operating costs and expenses [2] 55 62 134 168
Operating Segments [Member] | Other Midstream [Member] | Excluding Certain Other Nonoperating Items [Member]        
Segment Reporting Information [Line Items]        
Other (income) expense, net 0 [3] 0 0 [3] 0
Other and Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 32   154  
Other 23 28 63 77
Total revenues and other (184)   (470)  
Net income (loss) attributable to noncontrolling interests 64 58 105 182
Total expenses and other 213 93 746 318
Consolidated Adjusted EBITDAX (394) (216) (1,206) (685)
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 199 (16) 437 (23)
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 0   7 (2)
Other and Intersegment Eliminations [Member] | Excluding Gains Losses On Divestitures Net [Member]        
Segment Reporting Information [Line Items]        
Total revenues and other [1] (181) (123) (467) (365)
Other and Intersegment Eliminations [Member] | Excluding Certain Items [Member]        
Segment Reporting Information [Line Items]        
Operating costs and expenses [2] (67) 49 195 135
Other and Intersegment Eliminations [Member] | Excluding Certain Other Nonoperating Items [Member]        
Segment Reporting Information [Line Items]        
Other (income) expense, net 17 [3] 2 9 [3] 24
Oil and Gas [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 3,607 2,610 9,801 7,927
Oil and Gas [Member] | Operating Segments [Member] | Exploration and Production [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 3,161 2,097 8,589 6,500
Oil and Gas [Member] | Operating Segments [Member] | Exploration and Production [Member] | Intersegment Revenues [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 25 4 49 10
Oil and Gas [Member] | Operating Segments [Member] | WES Midstream [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 394 445 1,063 1,213
Oil and Gas [Member] | Operating Segments [Member] | WES Midstream [Member] | Intersegment Revenues [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 114 119 369 387
Oil and Gas [Member] | Operating Segments [Member] | Other Midstream [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 39 53 73 134
Oil and Gas [Member] | Operating Segments [Member] | Other Midstream [Member] | Intersegment Revenues [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 78 43 188 125
Oil and Gas [Member] | Other and Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues 13 15 76 80
Oil and Gas [Member] | Other and Intersegment Eliminations [Member] | Intersegment Revenues [Member]        
Segment Reporting Information [Line Items]        
Sales Revenues $ (217) $ (166) $ (606) $ (522)
[1] Total revenues and other excludes gains (losses) on divestitures, net since these gains and losses are excluded from Adjusted EBITDAX.
[2] Operating costs and expenses excludes exploration expense, DD&A, impairments, restructuring charges, and certain other operating expenses since these expenses are excluded from Adjusted EBITDAX
[3] Other (income) expense, net excludes restructuring charges since these expenses are excluded from Adjusted EBITDAX.