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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2018
Variable Interest Entity [Line Items]  
Schedule of Variable Interest Entities [Table Text Block]
The carrying amounts and classification of assets and liabilities for variable interest entities in our Consolidated Balance Sheet as of December 31, 2018 and 2017 are as follows:
(dollars in millions)
2018
 
2017
Current assets
$
4,732

 
$
3,976

Noncurrent assets
1,600

 
1,534

Total assets
$
6,332

 
$
5,510

Current liabilities
$
4,946

 
$
3,601

Noncurrent liabilities
1,898

 
2,086

Total liabilities
$
6,844

 
$
5,687