v2.4.0.6

Goodwill - Schedule of Changes in Goodwill (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Beginning balance, Cost	$ 2,454	$ 2,529
Beginning balance, Accumulated impairment	(223)	(230)
Beginning balance, Book value	2,231	2,299
Changes in book value:
Acquisitions	11
Divestments	(6)
Translation differences	41	(68)
Total changes	46	(68)
Ending balance, Cost	2,502	2,454
Ending balance, Accumulated impairment	(225)	(223)
Ending balance, Book value	$ 2,277	$ 2,231

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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