Outstanding Debt

Outstanding debt at March 31, 2019 consisted of the following (in millions):



March 31, 2019	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Cost			Carrying Value
Current liabilities:
0.35% Convertible Senior Notes due June 2020	$	1,000	$	(32	)	$	968
Long-term debt:
0.9% Convertible Senior Notes due September 2021	$	1,000	$	(56	)	$	944
0.8% (€1 Billion) Senior Notes due March 2022	1,123		(4		)	1,119
2.15% (€750 Million) Senior Notes due November 2022	842		(3		)	839
2.75% Senior Notes due March 2023	500		(3		)	497
2.375% (€1 Billion) Senior Notes due September 2024	1,123		(10		)	1,113
3.65% Senior Notes due March 2025	500		(3		)	497
3.6% Senior Notes due June 2026	1,000		(6		)	994
1.8% (€1 Billion) Senior Notes due March 2027	1,123		(4		)	1,119
3.55% Senior Notes due March 2028	500		(3		)	497
Total long-term debt	$	7,711	$	(92	)	$	7,619

Outstanding debt at December 31, 2018 consisted of the following (in millions):



December 31, 2018	Outstanding Principal Amount		Unamortized Debt Discount and Debt Issuance Cost			Carrying Value
Long-term debt:
0.35% Convertible Senior Notes due June 2020	$	1,000	$	(39	)	$	961
0.9% Convertible Senior Notes due September 2021	1,000		(61		)	939
0.8% (€1 Billion) Senior Notes due March 2022	1,143		(5		)	1,138
2.15% (€750 Million) Senior Notes due November 2022	858		(4		)	854
2.75% Senior Notes due March 2023	500		(3		)	497
2.375% (€1 Billion) Senior Notes due September 2024	1,143		(10		)	1,133
3.65% Senior Notes due March 2025	500		(3		)	497
3.6% Senior Notes due June 2026	1,000		(6		)	994
1.8% (€1 Billion) Senior Notes due March 2027	1,143		(4		)	1,139
3.55% Senior Notes due March 2028	500		(3		)	497
Total long-term debt	$	8,787	$	(138	)	$	8,649