Description of Company and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Description of Company and Significant Accounting Policies [Abstract]
Number of business segments	2
Revenue recognition [Abstract]
Standard contract period for revenue recognition of maintenance and support fees (in years)	1
Research and development [Abstract]
Research and development costs	$ 401	$ 366	$ 325
Cash equivalents [Abstract]
Cash equivalents, maximum maturity (in months)	3
Goodwill and other intangible assets [Abstract]
Goodwill acquired during the period	424
Finite-lived intangible assets [Abstract]
Minimum useful life of finite-lived intangible assets (in years)	3
Maximum useful life of finite-lived intangible assets (in years)	20
Completion And Production [Member]
Goodwill and other intangible assets [Abstract]
Goodwill acquired during the period	411
Drilling And Evaluation [Member]
Goodwill and other intangible assets [Abstract]
Goodwill acquired during the period	$ 13