Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Common Class A [Member]
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	55,000,000	55,000,000
Common stock, shares issued (in shares)	52,000,000	52,000,000
Common Class B [Member]
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	5,000,000,000	5,000,000,000
Common stock, shares issued (in shares)	1,067,000,000	1,064,000,000
Treasury stock, at cost, Class B shares (in shares)	503,000,000	501,000,000