Acquisitions, Divestitures, Decommissioning and Restructuring Activities - Narrative (Divestitures, Decommissioning, and Restructuring) (Details) shares in Thousands, $ in Millions	1 Months Ended							12 Months Ended			42 Months Ended
	Dec. 31, 2021 USD ($)	Oct. 31, 2021 USD ($) a shares	Mar. 31, 2021 USD ($)	Oct. 31, 2020 employee	Jul. 31, 2020 USD ($)	May 31, 2020 USD ($) a	May 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) a	Jul. 01, 2022	Oct. 01, 2021 USD ($) a	Jan. 01, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets								$ 3,244	$ 60	$ 149
Gain (loss) on disposition of assets, net								(1,067)	9	(477)
Disposal group, contingent consideration received					$ 49
Contingent consideration, valuation adjustment								0	(42)	(45)
South Texas deficiency fee obligation, net								(10)	80	0
Increase (decrease) in deficiency fee receivable								(4)
Restricted cash	$ 50						$ 75	50					$ 50
Sand mine decommissioning-related charges (Note 3)								0	0	23
Number of positions eliminated | employee				300
Restructuring charges (Note 3)								2	79	159
Employee Severance
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges (Note 3)								2	79
Noncash stock-based compensation								0	4
Employee Severance | 2020 Corporate Restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges (Note 3)									78
Employee Severance | 2019 corporate restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges (Note 3)										159
One-time Termination Benefits | 2020 Corporate Restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges (Note 3)									5
One-time Termination Benefits | 2019 corporate restructuring
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncash stock-based compensation										26
Wells Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets			$ 20
Gain (loss) on sale								9
Additional contingent proceeds			$ 4
Additional contingent proceeds, payout period			3 years
Vertical Wells in Upton County
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale						$ 6
South Texas Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets							2
Total consideration							210
Contingent consideration							136
Guarantor obligations, reimbursement	84							84
Gain (loss) on disposition of assets, net							525
Contingent consideration period						5 years
South Texas deficiency fee obligation, net									84
Deficiency fee liability	191							191
Increase (decrease) in deficiency fee receivable								$ (7)	$ (4)
South Texas Divestiture | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss contingency, obligation, percentage											10000.00%
Loss contingency, buyer recovery, percentage											18.00%
South Texas Divestiture | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss contingency, obligation, percentage								10000.00%
Deficiency fee liability	211							$ 211
South Texas Divestiture | Maximum | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss contingency, obligation, percentage											10000.00%
Loss contingency, buyer recovery, percentage											18.00%
South Texas Divestiture | South Texas Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Guarantor obligations, reimbursement							$ 72
Sand mine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets to be disposed of										13
Vertical integration services (gain) loss (j)										12
Sold | Delaware Basin Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets	3,100
Gain (loss) on sale	$ (1,100)
Sold | Laredo Petroleum, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets		$ 137
Gain (loss) on sale		$ 1
Area of land | a		20,000										20,000
Shares received (in shares) | shares		960
Total consideration												$ 206
Sold | Vertical Wells in Upton County
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets						$ 6
Area of land | a						1,500
Sold | Vertical and Horizontal Wells In Glasscock County
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of assets										129
Gain (loss) on sale										$ 68
Area of land | a										7,800