Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 12,475	$ 11,322
Revenue:
Total revenue	32,870	29,402	28,503
Operating income:
Total operating income	5,097	3,138	4,159
Interest expense, net of interest income	(383)	(331)	(298)
Other, net	(2)	(43)	(39)
Income from continuing operations before income taxes	4,712	2,764	3,822
Capital expenditures:
Total capital expenditures	3,283	2,934	3,566
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	2,126	1,900	1,628
Revenue:
Total revenue	32,870	29,402	28,503
Total assets:
Total assets	32,240	29,223
Completion and Production
Revenue:
Total revenue	20,253	17,506	17,380
Operating income:
Total operating income	3,610	2,875	3,144
Capital expenditures:
Total capital expenditures	1,953	1,676	2,177
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	1,162	1,013	843
Revenue:
Total revenue	20,253	17,506	17,380
Total assets:
Total assets	16,033	14,203
Drilling and Evaluation
Revenue:
Total revenue	12,617	11,896	11,123
Operating income:
Total operating income	1,671	1,770	1,675
Capital expenditures:
Total capital expenditures	1,297	1,210	1,318
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	934	873	783
Revenue:
Total revenue	12,617	11,896	11,123
Total assets:
Total assets	11,237	10,010
Shared assets
Total assets:
Total assets	1,930	1,351
Total operations
Operating income:
Total operating income	5,281	4,645	4,819
Corporate and other
Operating income:
Total operating income	(184)	(1,507)	(660)
Capital expenditures:
Total capital expenditures	33	48	71
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	30	14	2
Total assets:
Total assets	3,040	3,659
North America [Member]
Segment Reporting Information [Line Items]
Revenues	17,698	15,212	16,004
Property, Plant and Equipment, Net	6,057	5,687
Latin America [Member]
Segment Reporting Information [Line Items]
Revenues	3,875	3,909	3,694
Property, Plant and Equipment, Net	1,406	1,227
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	5,490	5,225	4,510
Property, Plant and Equipment, Net	1,832	1,639
Middle East/Asia [Member]
Segment Reporting Information [Line Items]
Revenues	5,807	5,056	4,295
Property, Plant and Equipment, Net	$ 3,180	$ 2,769