Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of classification and fair value of derivative instruments

The following table summarizes the classification and fair values of derivative instruments in our Consolidated Balance Sheets (in millions):

	December 31, 2018
	Asset Derivatives			Liability Derivatives
	Classification	Fair Value		Classification	Fair Value
Derivatives designated as hedges:
Foreign currency exchange contracts	Other current assets	$	73	Other accrued liabilities	$	(1	)
Foreign currency exchange contracts	Other long-term assets	5		Other long-term obligations	—
Total derivatives designated as hedges		78			(1		)
Derivatives not designated as hedges:
Foreign currency exchange contracts	Other current assets	—		Other accrued liabilities	—
Total derivatives not designated as hedges		—			—
Total derivatives		$	78		$	(1	)

	December 31, 2017
	Asset Derivatives			Liability Derivatives
	Classification	Fair Value		Classification	Fair Value
Derivatives designated as hedges:
Foreign currency exchange contracts	Other current assets	$	2	Other accrued liabilities	$	(89	)
Foreign currency exchange contracts	Other long-term assets	1		Other long-term obligations	(3		)
Total derivatives designated as hedges		3			(92		)
Derivatives not designated as hedges:
Foreign currency exchange contracts	Other current assets	10		Other accrued liabilities	(1		)
Total derivatives not designated as hedges		10			(1		)
Total derivatives		$	13		$	(93	)

Summary of effect of foreign currency exchange contracts

The following table summarizes the effect of our foreign currency exchange contracts on our Consolidated Financial Statements (in millions):

	Year Ended December 31,
	2018			2017			2016
Derivatives designated as hedges:
Gains (losses) recognized in AOCI	$	114		$	(315	)	$	5
Gains (losses) reclassified from AOCI into product sales	$	(87	)	$	(28	)	$	73
Gains (losses) recognized in Other income (expense), net	$	—		$	41		$	(32	)
Derivatives not designated as hedges:
Gains (losses) recognized in Other income (expense), net	$	(2	)	$	(113	)	$	206

Summary of potential effect of offsetting derivatives

The following table summarizes the potential effect of offsetting derivatives by type of financial instrument on our Consolidated Balance Sheets (in millions):

As of December 31, 2018
Offsetting of Derivative Assets/Liabilities
									Gross Amounts Not Offset on the Consolidated Balance Sheets
Description	Gross Amounts of Recognized Assets/Liabilities			Gross Amounts Offset on the Consolidated Balance Sheets		Amounts of Assets/Liabilities Presented on the Consolidated Balance Sheets			Derivative Financial Instruments			Cash Collateral Received/Pledged		Net Amount (Legal Offset)
Derivative assets	$	78		$	—	$	78		$	(1	)	$	—	$	77
Derivative liabilities	(1		)	—		(1		)	1			—		—
As of December 31, 2017
Offsetting of Derivative Assets/Liabilities
									Gross Amounts Not Offset on the Consolidated Balance Sheets
Description	Gross Amounts of Recognized Assets/Liabilities			Gross Amounts Offset on the Consolidated Balance Sheets		Amounts of Assets/Liabilities Presented on the Consolidated Balance Sheets			Derivative Financial Instruments			Cash Collateral Received/Pledged		Net Amount (Legal Offset)
Derivative assets	$	13		$	—	$	13		$	(8	)	$	—	$	5
Derivative liabilities	(93		)	—		(93		)	8			—		(85		)