Income Taxes (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 18,000,000		$ 76,000,000	$ (265,000,000)		$ 190,000,000
Income (loss) from continuing operations before income taxes	(1,000,000)		$ 372,000,000	$ (2,980,000,000)		$ 715,000,000
Effective tax rate			20.40%	8.90%		26.60%
Impairments and other charges	133,000,000	[1]	$ 0	$ 3,353,000,000	[1]	$ 308,000,000	[1]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount				696,000,000
Deferred Tax Assets, Valuation Allowance	310,000,000			310,000,000
Loss on early extinguishment of debt	$ 0		$ 0	$ (168,000,000)	[2]	$ 0

[1] For the three months ended September 30, 2020, amount includes approximately $90 million attributable to Completion and Production, $40 million attributable to Drilling and Evaluation, and $3 million attributable to Corporate and other. For the nine months ended September 30, 2020, amount includes $2.1 billion attributable to Completion and Production, $1.2 billion attributable to Drilling and Evaluation, and $44 million attributable to Corporate and other. For the nine months ended September 30, 2019, amount includes $127 million attributable to Completion and Production, $153 million attributable to Drilling and Evaluation, and $28 million attributable to Corporate and other. See Note 2 for further discussion on these impairments and other charges. There were no impairments and other charges recorded during the three months ended September 30, 2019.

[2] For the nine months ended September 30, 2020, amount includes a $168 million loss on extinguishment of debt related to the early repurchase of senior notes. See Note 6 for further discussion on this charge.