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The Company and Summary of Significant Accounting Policies (Details) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) shares | Sep. 30, 2020 USD ($) segment | Jul. 17, 2020 USD ($) | Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of reportable segments | segment |  | 1 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for doubtful accounts |  | $ 105 |  | $ 82
Increase in allowance for doubtful accounts receivable |  | 23 |  |
Allowance for doubtful accounts receivable, write-offs |  | $ 80 |  |
Minimum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, number of days outstanding |  | 0 days |  |
Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, number of days outstanding |  | 180 days |  |
Discontinued Operations, Held-for-sale | Classifieds |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Amount of consideration to be received, subject to adjustments |  |  | $ 9,200 |
Discontinued Operations, Held-for-sale | Classifieds | Forecast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Proceeds from sale of business | $ 2,500 |  |  |
Number of shares to be received from the sale | shares | 540 |  |  |

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