Segment Information - Geographical Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Geographic Data
Total revenues	$ 42,078	$ 23,290	$ 33,669
Long-Lived Assets	22,373	20,788
United States
Geographic Data
Total revenues	34,458	17,942	27,162
Long-Lived Assets	18,279	16,896
Canada
Geographic Data
Total revenues	7,620	5,348	$ 6,507
Long-Lived Assets	$ 4,094	$ 3,892