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Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2020
Schedule of Variable Interest Entities [Abstract]  
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, 2020 and 2019 are as follows:
(dollars in millions)20202019
Current assets$6,652 $5,448 
Noncurrent assets868 894 
Total assets$7,520 $6,342 
Current liabilities$7,365 $6,971 
Noncurrent liabilities89 94 
Total liabilities$7,454 $7,065