Business Segments - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 1,724	$ 3,909	$ 3,913	$ 8,729
Total operating profit (loss)	$ (270)	$ 438	$ (459)	$ 1,008
Percentage as of operating profit (loss) to revenue	(15.70%)	11.20%	(11.70%)	11.50%
Operating Segments [Member] \| Rig Systems [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 564	$ 1,930	$ 1,490	$ 4,453
Total operating profit (loss)	$ 7	$ 421	$ 74	$ 898
Percentage as of operating profit (loss) to revenue	1.20%	21.80%	5.00%	20.20%
Operating Segments [Member] \| Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 364	$ 657	$ 755	$ 1,376
Total operating profit (loss)	$ 62	$ 153	$ 131	$ 357
Percentage as of operating profit (loss) to revenue	17.00%	23.30%	17.40%	25.90%
Operating Segments [Member] \| Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 511	$ 956	$ 1,142	$ 2,127
Total operating profit (loss)	$ (146)	$ 48	$ (237)	$ 143
Percentage as of operating profit (loss) to revenue	(28.60%)	5.00%	(20.80%)	6.70%
Operating Segments [Member] \| Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 538	$ 873	$ 1,096	$ 1,821
Total operating profit (loss)	$ (33)	$ 85	$ (71)	$ 173
Percentage as of operating profit (loss) to revenue	(6.10%)	9.70%	(6.50%)	9.50%
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Total revenue	$ (253)	$ (507)	$ (570)	$ (1,048)
Total operating profit (loss)	$ (160)	$ (269)	$ (356)	$ (563)