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Debt - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2024 | Feb. 22, 2024 | Feb. 15, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Apr. 16, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | $ 6,217 | $ 2,614 |
Unamortized debt discount |  |  |  |  | 249 |  |
Secured Debt | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 2,500 |  |  |  |  |
Secured Debt | Term Loan Facility | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt | $ 1,800 |  |  |  |  |  |
Secured Debt | Term Loan Due 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 1,370 |  | $ 1,000 |  | $ 1,000 |
Secured Debt | Aircraft Purchase Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  | $ 900 |  |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  | 2.75% |  |  |  |  |
Debt instrument, interest rate floor |  | 0.00% |  |  |  |  |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Aircraft Purchase Financing |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  |  |  |  | 2.00% |  |
Secured Debt | Other Market Rate Loans | Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  | 1.75% |  |  |  |  |
Debt instrument, interest rate floor |  | 1.00% |  |  |  |  |
Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, increase (decrease) in maximum borrowing capacity |  |  | $ 1,115 |  |  |  | $ 100
Undrawn and available amount under revolving credit facility |  |  |  |  | $ 2,965 |  |
Secured Debt | Revolving Credit Facility | Extending Lenders |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 2,700 |  |  |  | 2,800
Secured Debt | Revolving Credit Facility | Non-Extending Lenders |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 165 |  |  |  | $ 165
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  |  | 3.00% |  |  |  |
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  |  | 3.50% |  |  |  |
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rate Loans | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  |  | 2.00% |  |  |  |
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rate Loans | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent spread on variable rate |  |  | 2.50% |  |  |  |

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