Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 26, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016
(Provision) Benefit for Income Taxes		$ (692)	$ 65	$ (489)	$ 197
Income (Loss) Before Income Taxes		(1,084)	(226)	(2,340)	(948)
Valuation allowance		526		526
Long-Lived Asset Impairments and Other Charges		436		436	124
Excess and obsolete inventory charges		198		213	9
Accounts receivable reserves and write-offs		62		62
Other asset write-offs and charges		44
Pressure pumping business related charges			15	20	52
Supply agreement charges related to a non-core business divestiture			2	15	32
Non-cash tax expense on additional anticipated distributions of subsidiary earnings		137		137
Gain (Loss) Related to Litigation Settlement				(140)
Foreign Exchange Related Charges		0	26	31	68
Bond Tender Premium, Net		0	0	(78)	0
Financing Receivable, Allowance for Credit Losses, Write-downs				84
Restructuring Charges		22	49	150	159
Litigation Settlement, Amount	$ 150				(112)
Equity Investment Impairment		$ 0	0	$ 0	20
Scenario, Forecast
Uncertain tax positions, estimated for next twelve months						$ 42
IRAQ
Loss on Contracts			44		71
2015 Plan [Member]
Restructuring Charges			$ 49		$ 159