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Income taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Estimated annual effective tax rate (in hundredths)	22.00%
Statutory corporate tax rate (in hundredths)	35.00%
Discrete tax benefit from the reinstatement of the federal research tax credit retroactive to the beginning of 2012	$ (65)

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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