Condensed Consolidated Statement of Changes in Stockholders' Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Millions	Total	Class B Common Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2015	$ 1,412			$ 741	$ 826	$ (63)	$ (92)
Beginning balance, shares at Dec. 31, 2015	132,443,111	12,799,999	133,836,242				(1,393,131)
Net income	$ 27				27
Other comprehensive income	9					9
Issuance of common stock related to exercises of options and vesting of RSUs	2			2
Issuance of common stock related to exercises of options and vesting of RSUs, shares			459,154
Repurchase of common stock	$ (1)						$ (1)
Repurchase of common stock, shares	(24,077)						(24,077)
Tax benefits on equity awards, net	$ 2			2
Minimum withholding taxes on net share settlements of equity awards	(9)			(9)
Stock-based compensation	22			22
Ending balance at Mar. 31, 2016	$ 1,464			$ 758	$ 853	$ (54)	$ (93)
Ending balance, shares at Mar. 31, 2016	132,878,188	12,799,999	134,295,396				(1,417,208)