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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 are as follows:
(dollars in millions)
2017
 
2016
Current assets
$
3,976

 
$
2,722

Noncurrent assets
1,534

 
1,334

Total assets
$
5,510

 
$
4,056

Current liabilities
$
3,601

 
$
2,422

Noncurrent liabilities
2,086

 
1,636

Total liabilities
$
5,687

 
$
4,058