The following table summarizes our borrowings under various financing arrangements (in millions):



				Carrying Amount
Type of Borrowing	Issue Date	Due Date	Interest Rate	March 31, 2018		December 31, 2017
Senior Unsecured	September 2015	September 2018	1.85%	$	999	$	999
Senior Unsecured	September 2017	September 2018	3-month LIBOR + 0.17%	749		749
Term Loan	October 2017	October 2018	Variable	—		999
Senior Unsecured	September 2017	March 2019	3-month LIBOR + 0.22%	749		748
Senior Unsecured	March 2014	April 2019	2.05%	499		499
Senior Unsecured	September 2017	September 2019	1.85%	997		997
Senior Unsecured	September 2017	September 2019	3-month LIBOR + 0.25%	499		499
Senior Unsecured	November 2014	February 2020	2.35%	499		499
Senior Unsecured	September 2015	September 2020	2.55%	1,994		1,994
Term Loan	October 2017	October 2020	Variable	—		998
Senior Unsecured	March 2011	April 2021	4.50%	996		995
Senior Unsecured	December 2011	December 2021	4.40%	1,247		1,246
Senior Unsecured	September 2016	March 2022	1.95%	498		497
Senior Unsecured	September 2015	September 2022	3.25%	996		996
Term Loan	October 2017	October 2022	Variable	—		2,497
Senior Unsecured	September 2016	September 2023	2.50%	745		745
Senior Unsecured	March 2014	April 2024	3.70%	1,743		1,742
Senior Unsecured	November 2014	February 2025	3.50%	1,744		1,744
Senior Unsecured	September 2015	March 2026	3.65%	2,729		2,729
Senior Unsecured	September 2016	March 2027	2.95%	1,244		1,244
Senior Unsecured	September 2015	September 2035	4.60%	990		990
Senior Unsecured	September 2016	September 2036	4.00%	740		740
Senior Unsecured	December 2011	December 2041	5.65%	995		995
Senior Unsecured	March 2014	April 2044	4.80%	1,733		1,733
Senior Unsecured	November 2014	February 2045	4.50%	1,730		1,730
Senior Unsecured	September 2015	March 2046	4.75%	2,215		2,215
Senior Unsecured	September 2016	March 2047	4.15%	1,724		1,723
Total debt, net				29,054		33,542
Less current portion				2,497		2,747
Total long-term debt, net				$	26,557	$	30,795