Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017:

(dollars in millions)	Balance Sheet Location	December 31, 2018			December 31, 2017
Derivatives designated as hedging instruments:
Foreign exchange contracts	Asset Derivatives:
	Other assets, current	$	10		$	77
	Other assets	12			101
	Total asset derivatives	$	22		$	178
	Liability Derivatives:
	Accrued liabilities	(83		)	(10		)
	Other long-term liabilities	(111		)	(8		)
	Total liability derivatives	$	(194	)	$	(18	)
Derivatives not designated as hedging instruments:
Foreign exchange contracts	Asset Derivatives:
	Other assets, current	44			70
	Other assets	19			5
	Total asset derivatives	$	63		$	75
	Liability Derivatives:
	Accrued liabilities	(89		)	(57		)
	Other long-term liabilities	(3		)	(3		)
	Total liability derivatives	$	(92	)	$	(60	)

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)	2018			2017
(Loss) Gain recorded in Accumulated other comprehensive loss	$	(307	)	$	347
Gain reclassified from Accumulated other comprehensive loss into Product sales	$	(16	)	$	(39	)

Other Income (Expense) [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) [Table Text Block]

	Year Ended December 31,
(dollars in millions)	2018		2017
Gain recognized in Other income, net	$	115	$	77