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Fair Value - Fair Value Hierarchy (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets
Available-for-sale investment securities	$ 167,000,000	$ 337,000,000
Fair Value, Recurring
Assets
Cash equivalents	645,000,000	665,000,000
Available-for-sale investment securities	167,000,000	337,000,000
Equity investment securities		8,000,000
Aircraft fuel derivatives	3,000,000	3,000,000
Fair Value, Recurring | Level 1
Assets
Cash equivalents	645,000,000	665,000,000
Available-for-sale investment securities	0	0
Equity investment securities	0	8,000,000
Aircraft fuel derivatives	0	0
Fair Value, Recurring | Level 2
Assets
Cash equivalents	0	0
Available-for-sale investment securities	154,000,000	324,000,000
Equity investment securities		0
Aircraft fuel derivatives	3,000,000	3,000,000
Fair Value, Recurring | Level 3
Assets
Cash equivalents	0	0
Available-for-sale investment securities	13,000,000	13,000,000
Equity investment securities		0
Aircraft fuel derivatives	$ 0	$ 0

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