Short-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Short-Term Debt

	At December 31
	2017			2016
Commercial paper1	$	5,379		$	10,410
Notes payable to banks and others with originating terms of one year or less	—			50
Current maturities of long-term debt2	6,720			6,253
Current maturities of long-term capital leases	15			14
Redeemable long-term obligations
Long-term debt	3,078			3,113
Capital leases	—			—
Subtotal	15,192			19,840
Reclassified to long-term debt	(10,000		)	(9,000		)
Total short-term debt	$	5,192		$	10,840
1    Weighted-average interest rates at December 31, 2017 and 2016, were 1.30 percent and 0.74 percent, respectively.
2    Net of unamortized discounts and issuance costs.