CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable, allowance	$ 753	$ 729
Convertible preferred stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Common stock and capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock and capital stock, shares authorized (in shares)	15,000,000,000	15,000,000,000
Common stock and capital stock, shares issued (in shares)	688,335,000	695,556,000
Common stock and capital stock, shares outstanding (in shares)	688,335,000	695,556,000
Class A Common Stock
Common stock and capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock and capital stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock and capital stock, shares issued (in shares)	299,828,000	299,242,000
Common stock and capital stock, shares outstanding (in shares)	299,828,000	299,242,000
Class B Common Stock
Common stock and capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock and capital stock, shares authorized (in shares)	3,000,000,000	3,000,000,000
Common stock and capital stock, shares issued (in shares)	46,441,000	46,636,000
Common stock and capital stock, shares outstanding (in shares)	46,441,000	46,636,000
Class C Capital Stock
Common stock and capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock and capital stock, shares authorized (in shares)	3,000,000,000	3,000,000,000
Common stock and capital stock, shares issued (in shares)	342,066,000	349,678,000
Common stock and capital stock, shares outstanding (in shares)	342,066,000	349,678,000

Amount of allowance for credit loss on accounts receivable, classified as current.

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