Share-Based Compensation - Recognized Share-Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 1,081	$ 960	$ 825
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	729	628	564
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	314	294	231
Employee stock purchase plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 38	$ 38	$ 30