Debt - PSP Promissory Notes (Details) - PSP Promissory Notes $ in Billions	12 Months Ended
	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Aggregate principal issued	$ 3.7
Number of days within the occurrence of triggering event	30 days
Interest Rate First Five Years
Debt Instrument [Line Items]
Fixed interest rate per annum	1.00%
Interest Rate Years Six Through Ten | Secured Overnight Financing Rate or Other
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Floor interest rate	0.00%