Segment Information - Geographic Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Geographic Data
Revenues	$ 42,078	$ 23,290	$ 33,669
Long-lived assets	22,367	20,779
United States
Geographic Data
Revenues	34,458	17,942	27,162
Long-lived assets	18,273	16,887
Canada
Geographic Data
Revenues	7,620	5,348	$ 6,507
Long-lived assets	$ 4,094	$ 3,892