Debt and lines of credit (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of long-term debt Instruments

Long-term debt outstanding is as follows:

	March 31,			December 31,
	2015			2014
Notes due 2015 at 3.95% (assumed with National acquisition)	$	250		$	250
Notes due 2015 at 0.45%		750			750
Notes due 2016 at 2.375%		1,000			1,000
Notes due 2017 at 6.60% (assumed with National acquisition)		375			375
Notes due 2017 at 0.875%		250			250
Notes due 2018 at 1.00%		500			500
Notes due 2019 at 1.65%		750			750
Notes due 2021 at 2.75%		250			250
Notes due 2023 at 2.25%		500			500
Total debt		4,625			4,625
Net unamortized premium		13			17
Current portion of long-term debt		(1,000	)		(1,001	)
Long-term debt	$	3,638		$	3,641