Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Gain on formation of OneSubsea		$ 1,028
Acquisitions and investments, net of cash acquired	556	544
Shares of common stock issued in connection with acquisition	2.1
Value of common stock issued in connection with acquisition	213
One Subsea
Business Acquisition [Line Items]
Ownership interest in joint venture	40.00%
Gain on formation of OneSubsea	1,028
One Subsea | Parent Company
Business Acquisition [Line Items]
Purchase price	$ 600