Other Costs (Gains), Net - Asset Impairment Charges and Loss on Disposal of Non-Core Assets (Details) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($) reporting_unit	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Aug. 27, 2015 USD ($)	Dec. 31, 2014 USD ($)
Discontinued Operations [Line Items]
Number of reporting units | reporting_unit		6
Goodwill impairment	$ 0		$ 0		$ 517	$ 40
Goodwill	1,796				1,796			$ 2,461
Tangible asset impairment charges	18				54
Impairment of intangible assets (excluding goodwill)						4
Loss on disposal of non-core assets	6		$ 0		6	$ 0
LeTourneau Offshore Products Unit | Disposal Group, Held-for-sale, Not Discontinued Operations
Discontinued Operations [Line Items]
Disposal group, including discontinued operation, consideration							$ 100
Loss on disposal of non-core assets	6
Disposal group, including discontinued operation, assets, current	105				105
Disposal group, including discontinued operation, liabilities, current	1				1
CPS
Discontinued Operations [Line Items]
Goodwill impairment		$ 517		$ 40
Goodwill	$ 52				$ 52