Impairments and Other Charges (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Severance costs		$ 15	$ 83	$ 15	$ 356
Long-lived asset impairments		0	31	0	2,299
Inventory write-downs		0	11	0	505
Other		35	8	35	193
Restructuring and Related Cost, Accelerated Depreciation		36	0	36	0
Restructuring Cost and Reserve [Line Items]
Impairments and other charges	[1]	12	133	12	3,353
Operating lease right-of-use assets		984		984		$ 786
Current portion of operating lease liabilities		$ 258		258		$ 251
Sale and Leaseback Transaction, Gain (Loss), Net			0	(74)	0
Proceeds from Sale of Real Estate Held-for-investment				87	0
Minimum lease term
Restructuring Cost and Reserve [Line Items]
Sale Leaseback Transaction, Lease Terms		twelve
Maximum lease term
Restructuring Cost and Reserve [Line Items]
Sale Leaseback Transaction, Lease Terms		fifteen
Number of options to extend
Restructuring Cost and Reserve [Line Items]
Lessee, Operating Lease, Option to Extend		two
Structured Real Estate Transaction
Restructuring Cost and Reserve [Line Items]
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures		$ 349		349
Disposal Group, Including Discontinued Operation, Assets, Current		358		$ 358
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		276
Increase (Decrease) in Operating Lease Liability		$ 276
Lessee, Operating Lease, Renewal Term		5 years		5 years
Sale and Leaseback Transaction, Gain (Loss), Net		$ (74)
Lessee, Operating Lease, Existence of Option to Extend [true false]		true
LesseeOperatingLeaseVariableLeasePaymentTermsPercentage		1.35%
Proceeds from Sale of Real Estate Held-for-investment		$ 87
Completion And Production [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges		42	90	$ 42	2,100
Drilling And Evaluation [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges		9	40	9	1,200
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Impairments and other charges		$ (39)	$ 3	$ (39)	$ 44

[1] For the three and nine months ended September 30, 2021, amount includes a $42 million charge attributable to Completions and Production, a $9 million charge attributable to Drilling and Evaluation, and a $39 million net gain attributable to Corporate and other. For the three and nine months ended September 30, 2020, amount includes $90 million and $2.1 billion attributable to Completion and Production, $40 million and $1.2 billion attributable to Drilling and Evaluation, and $3 million and $44 million attributable to Corporate and other, respectively.