Debt and Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Summary of Debt Carrying Amount

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, 2019		December 31, 2018
Senior Unsecured	September 2017	March 2019	3-month LIBOR + 0.22%	$	—	$	750
Senior Unsecured	March 2014	April 2019	2.05%	500		500
Senior Unsecured	September 2017	September 2019	1.85%	999		999
Senior Unsecured	September 2017	September 2019	3-month LIBOR + 0.25%	500		499
Senior Unsecured	November 2014	February 2020	2.35%	499		499
Senior Unsecured	September 2015	September 2020	2.55%	1,997		1,996
Senior Unsecured	March 2011	April 2021	4.50%	997		997
Senior Unsecured	December 2011	December 2021	4.40%	1,247		1,247
Senior Unsecured	September 2016	March 2022	1.95%	498		498
Senior Unsecured	September 2015	September 2022	3.25%	997		997
Senior Unsecured	September 2016	September 2023	2.50%	746		746
Senior Unsecured	March 2014	April 2024	3.70%	1,744		1,744
Senior Unsecured	November 2014	February 2025	3.50%	1,745		1,745
Senior Unsecured	September 2015	March 2026	3.65%	2,732		2,731
Senior Unsecured	September 2016	March 2027	2.95%	1,245		1,245
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%	1,734		1,734
Senior Unsecured	November 2014	February 2045	4.50%	1,731		1,730
Senior Unsecured	September 2015	March 2046	4.75%	2,217		2,216
Senior Unsecured	September 2016	March 2047	4.15%	1,725		1,724
Total debt, net				26,578		27,322
Less current portion				2,498		2,748
Total long-term debt, net				$	24,080	$	24,574