Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract Acquisition Costs
Deferred contract costs	$ 175	$ 159
Long-term revenue contracts (as a percent)	25.00%
Weighted average remaining contract term	4 years
Deferred Sales Incentives [Member]
Contract Acquisition Costs
Deferred contract costs	$ 126	118
Selling, General and Administrative Expenses [Member]
Contract Acquisition Costs
Deferred contract costs amortization	$ 23	$ 23	$ 23
Minimum [Member]
Contract Acquisition Costs
Deferred revenue recognition period	1 month
Contract amortization period	5 years
Maximum [Member]
Contract Acquisition Costs
Deferred revenue recognition period	3 months
Contract amortization period	13 years