Debt and lines of credit (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt outstanding is as follows:

	September 30,		December 31,
	2019		2018
Notes due 2019 at 1.65%	$	—	$	750
Notes due 2020 at 1.75%	500		500
Notes due 2021 at 2.75%	550		550
Notes due 2022 at 1.85%	500		500
Notes due 2023 at 2.25%	500		500
Notes due 2024 at 2.625%	300		300
Notes due 2027 at 2.90%	500		500
Notes due 2029 at 2.25%	750		—
Notes due 2039 at 3.875%	750		—
Notes due 2048 at 4.15%	1,500		1,500
Total debt	5,850		5,100
Net unamortized discounts, premiums and issuance costs	(49)		(32)
Total debt, including net unamortized discounts, premiums and issuance costs	5,801		5,068
Current portion of long-term debt	(499)		(749)
Long-term debt	$	5,302	$	4,319