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Summary of Significant Accounting Policies - Prepaid Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loss Contingencies [Line Items] |  |
Prepaid expenses | $ 431 | $ 410
Receivables, long-term contracts or programs | 164 | 77
Credit Card Receivable Reserve |  |
Loss Contingencies [Line Items] |  |
Loss contingency accrual | $ 7 | $ 7

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