Leases (Lease Cost, Term and Discount Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 220	$ 166	$ 137
Variable lease cost	$ 48	$ 34	$ 34
Weighted-average remaining lease term (years)	6 years 7 months 17 days	7 years 7 days
Weighted-average discount rate	2.48%	2.86%