Business Segments and Geographic Areas - Other Costs by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Other costs	$ 131	$ 41	$ 18
Rig Technology [Member]
Segment Reporting Information [Line Items]
Other costs	45	17	8
Petroleum Services & Supplies [Member]
Segment Reporting Information [Line Items]
Other costs	18	23	9
Distribution & Transmission [Member]
Segment Reporting Information [Line Items]
Other costs	$ 68	$ 1	$ 1