Description of Business, Accounting Policies, and Supplemental Disclosures - Unearned Revenue (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Customer liability	$ 14.0	$ 11.6
Unearned revenue, revenue recognized	9.3
Unearned revenue, long-term	2.2	$ 1.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Accounting Policies [Abstract]
Remaining performance obligation, contracts exceeding one year	$ 80.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, weighted average remaining life	3 years 9 months 18 days