Our long-term debt consisted of the following (in millions):



	December 31,
	2017			2016
Notes
1.85% due 2018	$	750		$	750
4.25% due 2019	900			900
2.50% due 2020	1,250			1,250
3.35% due 2021	900			900
3.10% due 2023	500			500
2.90% due 2025	750			750
3.55% due 2026	2,000			2,000
3.60% due 2035	500			500
4.50% and 6.15% due 2036	1,054			1,152
4.85% due 2041	239			600
4.07% due 2042	1,336			1,336
3.80% due 2045	1,000			1,000
4.70% due 2046	1,326			2,000
4.09% due 2052	1,578			—
Other notes with rates from 5.50% to 8.50%, due 2023 to 2040	1,415			1,656
Total debt	15,498			15,294
Less: unamortized discounts and issuance costs	(1,235		)	(1,012		)
Total debt, net	14,263			14,282
Less: current portion	(750		)	—
Long-term debt, net	$	13,513		$	14,282