Leases - Lease Term and Discount Rate and Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finance Leases
Weighted-average remaining lease term	3 years 9 months 18 days	4 years 9 months 18 days
Weighted-average discount rate (as a percent)	3.40%	3.40%
Operating Leases
Weighted-average remaining lease term	7 years 2 months 12 days	5 years 9 months 18 days
Weighted-average discount rate (as percent)	2.10%	2.60%
Operating cash flows:
Cash paid for amounts included in measurement of operating lease liabilities	$ 50	$ 65	$ 62
Cash paid for amounts included in measurement of finance lease liabilities	2	2	2
Financing cash flows:
Cash paid for amounts included in measurement of finance lease liabilities	$ 9	$ 12	$ 13