Revenue Recognition - Disaggregation of Revenue by Geography (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue by Geography
Revenues	$ 17,618	$ 17,560	$ 54,093	$ 53,253
Americas
Revenue by Geography
Revenues	8,217	8,139	25,216	24,755
EMEA
Revenue by Geography
Revenues	5,593	5,564	17,272	16,775
Asia Pacific
Revenue by Geography
Revenues	$ 3,808	$ 3,857	$ 11,605	$ 11,723