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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2019
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, 2019 and 2018 are as follows:
(dollars in millions)20192018
Current assets$4,573  $4,732  
Noncurrent assets1,919  1,600  
Total assets$6,492  $6,332  
Current liabilities$4,916  $4,946  
Noncurrent liabilities2,149  1,898  
Total liabilities$7,065  $6,844