Number of votes allocated to each share, per class

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Stockholders' Equity (Narrative) (Details)	12 Months Ended
Stockholders' Equity (Narrative) (Details)	Dec. 31, 2019 USD ($) vote class $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Jul. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)
Stockholders Equity Note [Line Items]
Convertible preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Convertible preferred stock, par value (in dollars per share) \| $ / shares	$ 0.001	$ 0.001
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Number of authorized classes of stock \| class	3
Repurchases of capital stock \| $	$ 18,396,000,000	$ 9,075,000,000	$ 4,846,000,000
Class A Common Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) \| vote	1
Class B Common Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) \| vote	10
Class C Capital Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) \| vote	0
Class C Capital Stock \| Share Repurchase Program
Stockholders Equity Note [Line Items]
Authorized share repurchase amount \| $				$ 25,000,000,000.0	$ 12,500,000,000	$ 8,600,000,000
Repurchases of capital stock (in shares)	15,300,000	8,200,000
Repurchases of capital stock \| $	$ 18,400,000,000	$ 9,100,000,000