Revenues and Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues by Geographic Area
Revenues	[1]	$ 113,977	$ 64,912	$ 108,324
Geographic Information by Country for Long-Lived Assets
Long-lived assets		32,760	32,152
U.S. [Member]
Operating Revenues by Geographic Area
Revenues		82,940	45,174	77,173
Geographic Information by Country for Long-Lived Assets
Long-lived assets		28,518	28,184
Canada [Member]
Operating Revenues by Geographic Area
Revenues		6,597	4,294	7,915
Geographic Information by Country for Long-Lived Assets
Long-lived assets		1,855	1,877
U.K. and Ireland [Member]
Operating Revenues by Geographic Area
Revenues		13,307	9,268	13,584
Geographic Information by Country for Long-Lived Assets
Long-lived assets		1,528	1,353
Other Countries [Member]
Operating Revenues by Geographic Area
Revenues		11,133	6,176	$ 9,652
Mexico and Peru [Member]
Geographic Information by Country for Long-Lived Assets
Long-lived assets		$ 859	$ 738

[1] Includes excise taxes on sales by certain of our foreign operations of $5,645 million, $4,797 million, and $5,595 million for the years ended December 31, 2021, 2020, and 2019.