8. Goodwill

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


(Stated in millions)
	Reservoir Characterization			Drilling			Production			Distribution			Total
Balance at January 1, 2011	$	3,381		$	8,150		$	2,351		$	70		$	13,952
Adjustments relating to Smith acquisition		–			175			13			6			194
Other acquisitions		42			45			–			–			87
Divestiture of business		(51	)		–			–			–			(51	)
Impact of changes in exchange rates		(12	)		(8	)		(8	)		–			(28	)

Balance, December 31, 2011		3,360			8,362			2,356			76			14,154
Acquisitions		391			93			–			–			484
Reallocation		–			(125	)		125			–			–
Divestiture of business		–			–			–			(76	)		(76	)
Impact of changes in exchange rates		9			7			7			–			23

Balance, December 31, 2012	$	3,760		$	8,337		$	2,488		$	–		$	14,585