Business Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2013 IDEV Technologies	Aug. 31, 2013 OptiMedica
Business acquisitions
Percentage of voting interest acquired			100.00%	100.00%
Cash paid for business acquisition			$ 310	$ 260
Additional payments upon completion of certain development, regulatory and sales milestones				150
Non-deductible acquired in-process research and development			170	60
Non-deductible definite-lived intangible assets			66	160
Non-deductible goodwill	9,772	15,774	123	151
Net deferred tax liabilities			56	70
Contingent consideration				$ 70
Amortization period of acquired intangible assets	11 years		11 years	18 years