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Intangible Assets, net (Notes)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure [Text Block]
Intangible Assets

Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:
    
 
September 30, 2018
 
December 31, 2017
 
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
Customer relationships
$
1,628

 
$
(178
)
 
$
1,450

 
$
461

 
$
(108
)
 
$
353

Trade names
550

 
(12
)
 
$
538

 
—

 
—

 
—

Technology
161

 
(12
)
 
149

 
—

 
—

 
—

Long term supply contracts
150

 
(36
)
 
114

 
143

 
(27
)
 
116

 
$
2,489


$
(238
)

$
2,251

 
$
604

 
$
(135
)
 
$
469



The table above excludes other finite-lived intangible assets with net balances of $7 at September 30, 2018 and $3 at December 31, 2017. See Note C for additional information about the intangible assets acquired with Signode.

Total amortization expense of intangible assets was $51 and $103 and $9 and $29 for the three and nine months ended September 30, 2018 and 2017.