Assets and Liabilities Measured at Fair Value (Tables)

12 Months Ended

Dec. 31, 2016

Assets and Liabilities Measured at Fair Value

Schedule of assets and liabilities measured at fair value

	December 31, 2016				December 31, 2015
			Quoted prices	Significant other		Quoted prices	Significant other
			in active markets	observable		in active markets	observable
			for identical assets	inputs		for identical assets	inputs
Description	Total		(Level 1)	(Level 2)	Total	(Level 1)	(Level 2)
	amounts in millions
Cash equivalents	$	464	164	300	—	—	—
Foreign currency forward contracts	$	(4)	—	(4)	—	—	—
Time deposits	$	25	—	25	—	—	—
Available for sale securities	$	64	—	64	—	—	—