Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net		$ 11,322	$ 10,257
Charitable Contribution Tax Deductible	55
Revenue:
Total revenue		29,402	28,503	24,829
Operating income:
Total operating income		3,138	4,159	4,737
Interest expense, net of interest income		(331)	(298)	(263)
Other, net		(43)	(39)	(25)
Income from continuing operations before income taxes		2,764	3,822	4,449
Capital expenditures:
Total capital expenditures		2,934	3,566	2,953
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization		1,900	1,628	1,359
Revenue:
Total revenue		29,402	28,503	24,829
Total assets:
Total assets		29,223	27,410
Completion and Production
Revenue:
Total revenue		17,506	17,380	15,143
Operating income:
Total operating income		2,875	3,144	3,733
Capital expenditures:
Total capital expenditures		1,676	2,177	1,669
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization		1,013	843	680
Revenue:
Total revenue		17,506	17,380	15,143
Total assets:
Total assets		14,203	13,313
Drilling and Evaluation
Revenue:
Total revenue		11,896	11,123	9,686
Operating income:
Total operating income		1,770	1,675	1,403
Capital expenditures:
Total capital expenditures		1,210	1,318	1,231
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization		873	783	676
Revenue:
Total revenue		11,896	11,123	9,686
Total assets:
Total assets		10,010	9,290
Shared assets
Total assets:
Total assets		1,351	1,376
Total operations
Operating income:
Total operating income		4,645	4,819	5,136
Corporate and other
Operating income:
Total operating income		(1,507)	(660)	(399)
Capital expenditures:
Total capital expenditures		48	71	53
Depreciation, depletion, and amortization:
Total depreciation, depletion and amortization		14	2	3
Total assets:
Total assets		3,659	3,431
All Other Countries [Domain]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net		5,954	5,161
Revenue:
United States		15,091	13,446	11,281
UNITED STATES
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net		5,368	5,096
Revenue:
United States		$ 14,311	$ 15,057	$ 13,548