Segments - Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information, Profit (Loss)
Operating revenue	$ 9,348	$ 4,150
Operating income (loss)	(783)	(1,398)
Interest expense, net	274	361
Depreciation and amortization	506	492
Total assets, end of period	73,748	73,083	$ 72,459
Net fair value obligations, end of period	(430)	(285)
Capital expenditures	1,766	438
Operating Segments | Airline
Segment Reporting Information, Profit (Loss)
Operating revenue	8,161	3,610
Operating income (loss)	(836)	(1,273)
Interest expense, net	274	361
Depreciation and amortization	506	492
Total assets, end of period	71,392	71,508
Net fair value obligations, end of period	0	0
Capital expenditures	1,749	425
Operating Segments | Refinery
Segment Reporting Information, Profit (Loss)
Operating revenue	2,313	1,047
Operating income (loss)	53	(125)
Interest expense, net	2	1
Depreciation and amortization	23	24
Total assets, end of period	2,382	1,578
Net fair value obligations, end of period	(430)	(285)
Capital expenditures	17	13
Intersegment Sales/Other
Segment Reporting Information, Profit (Loss)
Operating income (loss)	0	0
Interest expense, net	(2)	(1)
Depreciation and amortization	(23)	(24)
Total assets, end of period	(26)	(3)
Net fair value obligations, end of period	0	0
Capital expenditures	0	0
Intersegment Sales/Other | Sales to airline segment
Segment Reporting Information, Profit (Loss)
Operating revenue	(291)	0
Intersegment Sales/Other | Exchanged products
Segment Reporting Information, Profit (Loss)
Operating revenue	(809)	(503)
Intersegment Sales/Other | Sales of refined products
Segment Reporting Information, Profit (Loss)
Operating revenue	$ (26)	$ (4)