CONSOLIDATED BALANCE SHEETS (UNAUDITED) (UAH) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Receivables, allowance for credit losses	$ 19	$ 18
Aircraft fuel, spare, parts and supplies, obsolescence allowance	721	689
Intangibles, accumulated amortization	1,339	1,495
Investments in affiliates and other, allowance for credit losses	$ 32	$ 38
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000,000,000	1,000,000,000
Common shares, outstanding (in shares)	328,803,086	328,018,739