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Goodwill and other intangible assets - Intangible assets - Narrative (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Finite-lived Intangible Assets [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization expense	$ 264	$ 254
Unclassified Indefinite-lived Intangible Assets [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Intangible assets with indefinite lives, excluding goodwill	$ 2,325	$ 2,328

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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