Business Segments - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total Revenue	$ 3,306	$ 5,587	$ 12,035	$ 15,731
Total Operating Profit (loss)	$ 234	$ 988	$ 1,242	$ 2,700
Percentage as of operating profit (Loss) to revenue	7.10%	17.70%	10.30%	17.20%
Operating Segments [Member] \| Rig Systems [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 1,496	$ 2,659	$ 5,949	$ 7,287
Total Operating Profit (loss)	$ 253	$ 533	$ 1,093	$ 1,485
Percentage as of operating profit (Loss) to revenue	16.90%	20.00%	18.40%	20.40%
Operating Segments [Member] \| Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 570	$ 837	$ 1,946	$ 2,372
Total Operating Profit (loss)	$ 145	$ 229	$ 479	$ 637
Percentage as of operating profit (Loss) to revenue	25.40%	27.40%	24.60%	26.90%
Operating Segments [Member] \| Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 834	$ 1,469	$ 2,961	$ 4,193
Total Operating Profit (loss)	$ (7)	$ 278	$ 110	$ 762
Percentage as of operating profit (Loss) to revenue	(0.80%)	18.90%	3.70%	18.20%
Operating Segments [Member] \| Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 798	$ 1,191	$ 2,619	$ 3,320
Total Operating Profit (loss)	$ 3	$ 185	$ 160	$ 479
Percentage as of operating profit (Loss) to revenue	0.40%	15.50%	6.10%	14.40%
Unallocated Expenses and Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ (392)	$ (569)	$ (1,440)	$ (1,441)
Total Operating Profit (loss)	$ (160)	$ (237)	$ (600)	$ (663)