Goodwill (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill by reporting unit were as follows:

										(Stated in millions)
	Reservoir Characterization			Drilling			Production			Total
Balance at January 1, 2013	$	3,760		$	8,337		$	2,488			$	14,585
Acquisitions		4			3			336				343
Divestiture of business		—			—			(150	)			(150	)
Other		(27	)		(25	)		(20	)			(72	)
Balance, December 31, 2013		3,737			8,315			2,654				14,706
Acquisitions		15			271			551				837
Reallocation		83			(83	)		—				—
Other		(23	)		(15	)		(18	)			(56	)
Balance, December 31, 2014	$	3,812		$	8,488		$	3,187			$	15,487