Revenue - Revenue by Geographic Location (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 116,385	$ 103,564	$ 108,942
United States
Disaggregation of Revenue [Line Items]
Revenue	90,926	80,327	82,952
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	13,999	11,986	12,501
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 11,460	$ 11,251	$ 13,489