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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The following table summarizes the fair value and presentation in the Consolidated Balance Sheets for derivative instruments as of December 31, 2019 and 2018:
(dollars in millions)Balance Sheet LocationDecember 31, 2019December 31, 2018
Derivatives designated as hedging instruments:
Foreign exchange contractsAsset Derivatives:
Other assets, current$23 $22 
Liability Derivatives:
Accrued liabilities166 194 
Derivatives not designated as hedging instruments:
Foreign exchange contractsAsset Derivatives:
Other assets, current23 27 
Liability Derivatives:
Accrued liabilities116 89 
Reclassification out of Accumulated Other Comprehensive Income [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments, Gain (Loss) [Table Text Block]
  Year Ended December 31,
(dollars in millions)20192018
Loss recorded in Accumulated other comprehensive loss$(33)$(307)
Loss (Gain) reclassified from Accumulated other comprehensive loss into Product sales$51 $(16)
Other Income (Expense) [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative Instruments, Gain (Loss) [Table Text Block]
  Year Ended December 31,
(dollars in millions)20192018
Foreign exchange contracts$91 $127