Revenue Recognition - Disaggregation of Revenue by Geography (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue by Geography
Revenues	$ 18,745	$ 18,123	$ 36,474	$ 35,694
Americas
Revenue by Geography
Revenues	8,820	8,450	16,999	16,617
EMEA
Revenue by Geography
Revenues	6,038	5,695	11,679	11,212
Asia Pacific
Revenue by Geography
Revenues	$ 3,887	$ 3,977	$ 7,797	$ 7,865