Income Taxes Narrative (Details) $ in Millions		3 Months Ended			12 Months Ended
	Sep. 27, 2016 USD ($)	Dec. 31, 2017 USD ($) country	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) country	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)
Income Tax Contingency [Line Items]
Allowance for Doubtful Accounts Receivable, Write-offs					$ 230	$ 0	$ 0
Asset Write Down and Other					66
Pressure Pumping Related Charges						114	63
Supply Agreement Charges related to Non-Core Business Divestiture							67
Deferred Tax Assets, Valuation Allowance		$ 1,887			1,887	1,738		$ 73
Income Tax Expense (Benefit)					137	496	(145)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest					(2,656)	(2,877)	(2,096)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount					459	872	159
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense					52
Asset Impairment Charges						436
Restructuring Charges					183	280	232
Fair Value Adjustment of Warrants					(86)	(16)	0
Loss Contingency Accrual, Provision					(10)	220	116
Litigation Charges, Net	$ 140
Currency Devaluation Charges					0	41	85
Goodwill and Equity Investment Impairment					0	0	25
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount					0	(137)	(265)
Impairment of Long-Lived Assets Held-for-use					(928)	(436)	(638)
Production Related Impairments or Charges						219
Inventory Write-down					540	269	244
Gain (Loss) on Disposition of Business					96	0	(6)
Bad Debt Expense				$ 31	8	69	48
Undistributed Earnings of Foreign Subsidiaries		2,900			2,900
Operating Loss Carryforwards		5,000			5,000
Tax Credit Carryforward, Amount		98			98
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense					10	2	4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 61		$ 50	$ 61	51	50
Number of Countries in which Entity Operates | country		90			90
Decrease in Unrecognized Tax Benefits is Reasonably Possible		$ 12			$ 12
Bond Tender Premium, Net					0	(78)	0
Financing Receivable, Allowance for Credit Losses, Write-downs			$ 84			76
AR bad debt expense with no significant tax benefit						62
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amount					249	0	0
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Valuation Adjustment Amount					(301)	0	0
VENEZUELA
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		(73)
UNITED STATES
Income Tax Contingency [Line Items]
Operating Loss Carryforwards		1,900			1,900
Tax Credit Carryforward, Amount		82			82
IRAQ
Income Tax Contingency [Line Items]
Loss on Contracts					0		153
Foreign Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount		52			52
Research Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount		$ 30			$ 30
Drilling Rigs [Member]
Income Tax Contingency [Line Items]
Impairment of Long-Lived Assets Held-for-use							$ (255)
SEC Settlement [Member]
Income Tax Contingency [Line Items]
Litigation Charges, Net						$ 140