Business Segments - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenue	$ 1,646	$ 3,306	$ 5,559	$ 12,035
Total operating profit (loss)	$ (1,186)	$ 234	$ (1,645)	$ 1,242
Percentage as of operating profit (loss) to revenue	(72.10%)	7.10%	(29.60%)	10.30%
Operating Segments [Member] \| Rig Systems [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 470	$ 1,496	$ 1,960	$ 5,949
Total operating profit (loss)	$ (962)	$ 278	$ (888)	$ 1,176
Percentage as of operating profit (loss) to revenue	(204.70%)	18.60%	(45.30%)	19.80%
Operating Segments [Member] \| Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 322	$ 570	$ 1,077	$ 1,946
Total operating profit (loss)	$ 72	$ 157	$ 203	$ 514
Percentage as of operating profit (loss) to revenue	22.40%	27.50%	18.80%	26.40%
Operating Segments [Member] \| Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 526	$ 834	$ 1,668	$ 2,961
Total operating profit (loss)	$ (94)	$ (2)	$ (331)	$ 141
Percentage as of operating profit (loss) to revenue	(17.90%)	(0.20%)	(19.80%)	4.80%
Operating Segments [Member] \| Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 543	$ 798	$ 1,639	$ 2,619
Total operating profit (loss)	$ (61)	$ 10	$ (132)	$ 183
Percentage as of operating profit (loss) to revenue	(11.20%)	1.30%	(8.10%)	7.00%
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Total revenue	$ (215)	$ (392)	$ (785)	$ (1,440)
Total operating profit (loss)	$ (141)	$ (209)	$ (497)	$ (772)