Income Taxes Narrative (Details) $ in Millions		3 Months Ended							12 Months Ended
	Sep. 27, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) country	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Income Tax Contingency [Line Items]
Allowance for Doubtful Accounts Receivable, Write-offs									$ 62
Pressure Pumping Related Charges									114	$ 63
Supply Agreement Charges related to Non-Core Business Divestiture										67
Deferred Tax Assets, Valuation Allowance		$ 526		$ 868					1,738	868
Income Tax Expense (Benefit)									496	(145)	$ 284
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									(2,877)	(2,096)	(255)
Asset Impairment Charges		$ 436
Long-Lived Asset Impairments, Write-Downs and Other Charges									1,043	768	495
Restructuring Charges							$ 59		280	232	331
Litigation Charges, Net	$ 140								220	116	0
Currency Devaluation and Related Charges									41	85	245
Goodwill and Equity Investment Impairment									0	25	161
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount									137	265	0
Impairment of Long-Lived Assets Held-for-use								$ (352)	(436)	(638)	(495)
Production Related Impairments or Charges									219
Inventory Write-down				217					252	186	113
Gain (Loss) on Disposition of Business									0	(6)	349
Bad Debt Expense				31					69	48	27
Undistributed Earnings of Foreign Subsidiaries									3,600
Operating Loss Carryforwards									4,500
Tax Credit Carryforward, Amount									102
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									2	4	53
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued				50				$ 58	$ 51	50	58
Number of Countries in which Entity Operates | country									90
Decrease in Unrecognized Tax Benefits is Reasonably Possible									$ 40
Bond Tender Premium, Net									(78)	0	0
Financing Receivable, Allowance for Credit Losses, Write-downs			$ 84						76
UNITED STATES
Income Tax Contingency [Line Items]
Operating Loss Carryforwards									1,700
Tax Credit Carryforward, Amount									82
IRAQ
Income Tax Contingency [Line Items]
Loss on Contracts				$ 82	$ 44	$ 69	$ 42			153	72
Venezuelan Bolivar
Income Tax Contingency [Line Items]
Currency Devaluation and Related Charges										26	245
Currency devaluation expense											245
Foreign Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount									52
Research Tax Credit Carryforward [Member] | UNITED STATES
Income Tax Contingency [Line Items]
Tax Credit Carryforward, Amount									30
Goodwill [Member]
Income Tax Contingency [Line Items]
Goodwill, Impairment Loss											161
Drilling Rigs [Member]
Income Tax Contingency [Line Items]
Goodwill, Impairment Loss											$ 40
Impairment of Long-Lived Assets Held-for-use										(255)
Production Related Impairments or Charges										$ 26
SEC Settlement [Member]
Income Tax Contingency [Line Items]
Litigation Charges, Net									$ 140