Stockholders' Equity - Common Stock Shares Activity (Details) shares in Millions	6 Months Ended
Jun. 30, 2021 shares
Class of Stock
Purchases of treasury stock	(8.5)
Common Stock \| Class A
Class of Stock
Balance at December 31, 2020	986.9
Purchases of treasury stock	(8.5)
Share-based payments	1.1
Conversion of Class B to Class A common stock	0.3
Balance at June 30, 2021	979.8
Common Stock \| Class B
Class of Stock
Balance at December 31, 2020	8.3
Purchases of treasury stock	0.0
Share-based payments	0.0
Conversion of Class B to Class A common stock	(0.3)
Balance at June 30, 2021	8.0

Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, shares

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Number of shares issued which are neither cancelled nor held in the treasury.

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Number of shares that have been repurchased during the period and are being held in treasury.

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