Debt and Credit Facilities (Tables)

9 Months Ended

Sep. 30, 2016

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

The following table is a summary of our total debt and other debt information.

			September		December
			2016		2015
Senior unsecured notes:
	Rate	Due
	2.000%	09/30/2016	$	—	$	749
	1.300%	04/01/2018	598		597
	2.000%	03/08/2019	746		—
	4.375%	01/15/2020	497		496
	2.625%	03/15/2021	745		—
	3.375%	05/15/2024	631		606
	3.375%	11/01/2025	744		744
	3.500%	03/15/2026	986		—
	4.100%	04/01/2043	391		390
	4.375%	05/15/2044	394		394
	4.625%	03/15/2046	979		—
Commercial paper			100		—
Other			37		22
Total debt			$	6,848	$	3,998
Less current maturities			135		768
Total long-term debt			$	6,713	$	3,230
Unamortized debt issuance costs			$	46	$	24
Available borrowing capacity under all existing facilities			$	1,560	$	1,236
Fair value of debt			$	7,118	$	4,009