Revenue Recognition - Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Operating revenue	$ 13,824	$ 7,126	$ 23,173	$ 11,276
Other
Disaggregation of Revenue [Line Items]
Operating revenue	2,594	1,536	4,747	2,723
Refinery
Disaggregation of Revenue [Line Items]
Operating revenue	1,514	777	2,700	1,317
Loyalty program
Disaggregation of Revenue [Line Items]
Operating revenue	650	439	1,221	807
Ancillary businesses
Disaggregation of Revenue [Line Items]
Operating revenue	206	185	416	371
Miscellaneous
Disaggregation of Revenue [Line Items]
Operating revenue	$ 224	$ 135	$ 410	$ 228