Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Receivables, allowance for credit losses	$ 31	$ 28
Aircraft fuel, spare, parts and supplies, obsolescence allowance	578	546
Intangibles, accumulated amortization	1,451	1,544
Allowance for credit losses on investments in affiliates and other	$ 623	$ 622
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)	326,744,101	323,810,825