Business Segment and Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting [Abstract]
Depreciation, Depletion and Amortization	$ 285	$ 270	$ 846	$ 804
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	285	270	846	804
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	25,164		25,164		$ 25,587
Completion And Production [Member]
Segment Reporting [Abstract]
Cost, Direct Material	1,361	1,354	3,980	4,120
Cost, Direct Labor	492	482	1,449	1,443
Depreciation, Depletion and Amortization	156	146	462	440
Other Cost of Operating Revenue	700	648	2,065	1,990
Operating Expenses	2,709	2,630	7,956	7,993
Segment Reporting Information [Line Items]
Operating Expenses	2,709	2,630	7,956	7,993
Cost, Direct Material	1,361	1,354	3,980	4,120
Cost, Direct Labor	492	482	1,449	1,443
Depreciation, Depletion and Amortization	156	146	462	440
Other Cost of Operating Revenue	700	648	2,065	1,990
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,902		11,902		11,987
Drilling And Evaluation [Member]
Segment Reporting [Abstract]
Cost, Direct Material	911	926	2,715	2,864
Cost, Direct Labor	489	464	1,435	1,390
Depreciation, Depletion and Amortization	123	120	368	353
Other Cost of Operating Revenue	506	482	1,483	1,447
Operating Expenses	2,029	1,992	6,001	6,054
Segment Reporting Information [Line Items]
Operating Expenses	2,029	1,992	6,001	6,054
Cost, Direct Material	911	926	2,715	2,864
Cost, Direct Labor	489	464	1,435	1,390
Depreciation, Depletion and Amortization	123	120	368	353
Other Cost of Operating Revenue	506	482	1,483	1,447
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	8,043		8,043		7,806
Corporate Segment and Other Operating Segment [Member]
Segment Reporting [Abstract]
Depreciation, Depletion and Amortization	6	4	16	11
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	6	$ 4	16	$ 11
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 5,219		$ 5,219		$ 5,794