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Condensed Consolidated Financial Statement Details - Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, net | $ 12,414 |  | $ 12,414 |
Amortization expense of intangible assets | 598 |  | 1,193 | $ 1,192
Trademarks and Other Intangible Assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, net | $ 344 |  | $ 344 |
Amortization expense of intangible assets |  | $ 594 |  |

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