National Semiconductor acquisition (Pro forma) (Details) (National [Member], USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
National [Member]
Business Acquisition [Line Items]
Revenue	$ 3,818	$ 4,152	$ 11,385	$ 11,613
Net income	$ 589	$ 887	$ 1,930	$ 2,269
Earnings per common share - diluted	$ 0.50	$ 0.73	$ 1.61	$ 1.83

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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