Business Segments - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total Revenue	$ 3,909	$ 5,255	$ 8,729	$ 10,144
Total Operating Profit	$ 438	$ 913	$ 1,008	$ 1,712
Percentage as of operating profit to revenue	11.20%	17.40%	11.50%	16.90%
Operating Segments [Member] \| Rig Systems [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 1,930	$ 2,372	$ 4,453	$ 4,628
Total Operating Profit	$ 392	$ 501	$ 840	$ 952
Percentage as of operating profit to revenue	20.30%	21.10%	18.90%	20.60%
Operating Segments [Member] \| Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 657	$ 785	$ 1,376	$ 1,535
Total Operating Profit	$ 143	$ 217	$ 334	$ 408
Percentage as of operating profit to revenue	21.80%	27.60%	24.30%	26.60%
Operating Segments [Member] \| Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 956	$ 1,446	$ 2,127	$ 2,724
Total Operating Profit	$ 38	$ 263	$ 117	$ 484
Percentage as of operating profit to revenue	4.00%	18.20%	5.50%	17.80%
Operating Segments [Member] \| Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ 873	$ 1,127	$ 1,821	$ 2,129
Total Operating Profit	$ 78	$ 157	$ 157	$ 294
Percentage as of operating profit to revenue	8.90%	13.90%	8.60%	13.80%
Unallocated Expenses and Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenue	$ (507)	$ (475)	$ (1,048)	$ (872)
Total Operating Profit	$ (213)	$ (225)	$ (440)	$ (426)