Consolidated Balance Sheet (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Class A treasury stock, shares	368,000,000	342,000,000
Class A Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized shares	3,000,000,000	3,000,000,000
Common stock, issued	1,387,000,000	1,382,000,000
Common stock, outstanding	1,019,000,000	1,040,000,000
Class B Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized shares	1,200,000,000	1,200,000,000
Common stock, issued	12,000,000	14,000,000
Common stock, outstanding	12,000,000	14,000,000