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Short-Term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Short-Term Debt
 
At December 31
 
 
2018

 
 
2017

Commercial paper1
$
7,503

 
 
$
5,379

Notes payable to banks and others with originating terms of one year or less
28

 
 

Current maturities of long-term debt2
4,999

 
 
6,720

Current maturities of long-term capital leases
18

 
 
15

Redeemable long-term obligations
 
 
 
 
Long-term debt
3,078

 
 
3,078

Capital leases

 
 

Subtotal
15,626

 
 
15,192

Reclassified to long-term debt
(9,900
)
 
 
(10,000
)
Total short-term debt
$
5,726

 
 
$
5,192

1    Weighted-average interest rates at December 31, 2018 and 2017, were 2.43 percent and 1.30 percent, respectively.
 
 
 
 
2    Net of unamortized discounts and issuance costs: $1 in 2018 and $2 in 2017.