Assets and Liabilities Measured at Fair Value (Tables)

9 Months Ended

Sep. 30, 2017

Assets and Liabilities Measured at Fair Value

Schedule of assets and liabilities measured at fair value

	September 30, 2017				December 31, 2016
			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	$	892	159	733	464	164	300
Short-term marketable securities	$	541	—	541	72	—	72
Available for sale securities (1)	$	313	307	6	16	—	16
Debt	$	427	427	—	—	—	—

(1) Available for sale securities are included in the Other assets, net line item in the condensed consolidated balance sheet.