Revenue Recognition - Other Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Operating revenue	$ 29,899	$ 17,095	$ 47,007
Other
Disaggregation of Revenue [Line Items]
Operating revenue	6,348	3,604	3,977
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	3,229	1,150	97
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	1,770	1,458	1,962
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	793	648	1,200
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 556	$ 348	$ 718