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Debt and Credit Facilities (Tables)

6 Months Ended

Jun. 30, 2019

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

Summary of Total Debt				June 2019				December 2018
Senior unsecured notes:
	Rate		Due
	1.800%		January 15, 2019	$	—			$	500
	2.000%		March 8, 2019	—				750
	4.375%		January 15, 2020	500				499
	Variable		November 30, 2020	341				343
	2.625%		March 15, 2021	748				747
	1.125%		November 30, 2023	623				627
	3.375%		May 15, 2024	586				584
	3.375%		November 1, 2025	746				746
	3.500%		March 15, 2026	990				990
	2.125%		November 30, 2027	847				853
	3.650%		March 7, 2028	595				595
	2.625%		November 30, 2030	729				733
	4.100%		April 1, 2043	391				391
	4.375%		May 15, 2044	395				395
	4.625%		March 15, 2046	981				980
Other				41				126
Total debt				$	8,513			$	9,859
Less current maturities of debt				539				1,373
Total long-term debt				$	7,974			$	8,486
Unamortized debt issuance costs				$	47			$	50
Available borrowing capacity				$	1,531			$	1,548
Fair value of senior unsecured notes				$	9,142			$	9,746

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- Definition

Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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