Business Segment and Geographic Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 10,911	$ 12,475
Revenue:
Total revenue	23,633	32,870	$ 29,402
Operating income (loss):
Total operating income (loss)	(165)	5,097	3,138
Restructuring Charges	(2,177)	(129)	0
Interest expense, net of interest income	(447)	(383)	(331)
Other, net	(324)	(2)	(43)
Income (loss) from continuing operations before income taxes	(936)	4,712	2,764
Capital expenditures:
Total capital expenditures	2,184	3,283	2,934
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	1,835	2,126	1,900
Revenue:
Total revenue	23,633	32,870	29,402
Total assets:
Total assets	36,942	32,165
Completion and Production
Revenue:
Total revenue	13,682	20,253	17,506
Operating income (loss):
Total operating income (loss)	1,069	3,670	2,875
Restructuring Charges	(1,100)	(60)
Capital expenditures:
Total capital expenditures	1,526	1,953	1,676
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	1,160	1,162	1,013
Revenue:
Total revenue	13,682	20,253	17,506
Total assets:
Total assets	13,628	16,033
Drilling and Evaluation
Revenue:
Total revenue	9,951	12,617	11,896
Operating income (loss):
Total operating income (loss)	1,519	1,740	1,770
Restructuring Charges	(1,000)	(69)
Capital expenditures:
Total capital expenditures	650	1,297	1,210
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	638	934	873
Revenue:
Total revenue	9,951	12,617	11,896
Total assets:
Total assets	10,531	11,237
Shared assets
Total assets:
Total assets	1,785	1,930
Total operations
Operating income (loss):
Total operating income (loss)	2,588	5,410	4,645
Corporate and other
Operating income (loss):
Total operating income (loss)	(576)	(184)	(1,507)
Restructuring Charges	(88)
Capital expenditures:
Total capital expenditures	8	33	48
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization	37	30	14
Total assets:
Total assets	10,998	2,965
North America [Member]
Segment Reporting Information [Line Items]
Revenues	10,856	17,698	15,212
Property, Plant and Equipment, Net	5,745	6,057
Latin America [Member]
Segment Reporting Information [Line Items]
Revenues	3,149	3,875	3,909
Property, Plant and Equipment, Net	1,450	1,406
Europe/ Africa/ CIS [Member]
Segment Reporting Information [Line Items]
Revenues	4,175	5,490	5,225
Property, Plant and Equipment, Net	1,594	1,832
Middle East/Asia [Member]
Segment Reporting Information [Line Items]
Revenues	5,453	5,807	$ 5,056
Property, Plant and Equipment, Net	$ 2,122	$ 3,180