Our total debt consisted of the following (in millions):



	2018			2017
Notes
1.85% due 2018	$	—		$	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			1,054
4.07% due 2042	1,336			1,336
3.80% due 2045	1,000			1,000
4.70% due 2046	1,326			1,326
4.09% due 2052	1,578			1,578
Other notes with rates from 4.85% to 8.50%, due 2023 to 2041	1,618			1,654
Commercial paper	600			—
Total debt	15,312			15,498
Less: unamortized discounts and issuance costs	(1,208		)	(1,235		)
Total debt, net	14,104			14,263
Less: current portion	(1,500		)	(750		)
Long-term debt, net	$	12,604		$	13,513