Debt and Lines of Credit (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt outstanding as of December 31, 2015 and 2014is as follows:

	December 31,
	2015			2014
Notes due 2015 at 3.95% (assumed with National acquisition)	$	—		$	250
Notes due 2015 at 0.45%		—			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 2020 at 1.75%		500			—
Notes due 2021 at 2.75%		250			250
Notes due 2023 at 2.25%		500			500
Total debt		4,125			4,625
Net unamortized (discount) premium and debt issuance costs		(5	)		6
Total debt, including net unamortized (discount) premium and debt issuance costs		4,120			4,631
Current portion of long-term debt		(1,000	)		(1,001	)
Long-term debt	$	3,120		$	3,630