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Basis of Presentation (Details) $ in Millions		3 Months Ended			9 Months Ended
	Dec. 31, 2022 flight	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Accounting Policies [Abstract]
Customer reimbursements other expenses			$ 55
Net income		$ 193		$ 277	$ 717	$ 759
Loss on extinguishment of debt		0		76	0	192
Other (gains) losses, net		$ (23)		$ (39)	$ (44)	$ 57
Number of Cancelled Flights | flight	16,700

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