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Business Combinations - Preliminary Allocation Of The Aggregate Purchase Price (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 12, 2022 | Apr. 01, 2022 | Apr. 02, 2021 | Jan. 08, 2021
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |
Goodwill | $ 10,217 |  |  | $ 2,873 | $ 2,867 |
Avast plc |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |
Accounts receivable |  |  | $ 63 |  |  |
Other current assets |  |  | 17 |  |  |
Property and equipment |  |  | 33 |  |  |
Operating lease assets |  |  | 18 |  |  |
Intangible assets |  | $ 2,383 | 2,383 |  |  |
Goodwill |  |  | 7,349 |  |  |
Other long-term asset |  |  | 11 |  |  |
Total assets acquired |  |  | 9,874 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |
Current liabilities |  |  | 180 |  |  |
Contract liabilities |  |  | 509 |  |  |
Operating lease liabilities |  |  | 18 |  |  |
Long-term deferred tax liabilities |  |  | 433 |  |  |
Other long-term obligations |  |  | 46 |  |  |
Total liabilities assumed |  |  | 1,186 |  |  |
Total purchase price |  |  | $ 8,688 |  |  |
Avira |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 162
Goodwill |  |  |  |  |  | 261
Other long-term asset |  |  |  |  |  | 21
Current assets |  |  |  |  |  | 12
Total assets acquired |  |  |  |  |  | 456
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |
Current liabilities |  |  |  |  |  | 29
Contract liabilities |  |  |  |  |  | 54
Other long-term obligations |  |  |  |  |  | 29
Total liabilities assumed |  |  |  |  |  | 112
Total purchase price |  |  |  |  |  | $ 344

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