Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Less accumulated depreciation and amortization	$ 970	$ 847
Other intangible assets, accumulated amortization	$ 1,250	$ 1,175
Class A treasury stock, shares	385,000,000	368,000,000
Class A Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized	3,000,000,000	3,000,000,000
Common stock, issued	1,389,000,000	1,387,000,000
Common stock, outstanding	1,005,000,000	1,019,000,000
Class B Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized	1,200,000,000	1,200,000,000
Common stock, issued	11,000,000	12,000,000
Common stock, outstanding	11,000,000	12,000,000