Accounting Policies and Supplemental Disclosures - Unearned Revenue (Details) - USD ($) $ in Billions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Unearned revenue		$ 20.9
Unearned revenue, revenue recognized	$ 12.5
Unearned revenue, long-term	7.0	$ 5.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, contracts exceeding one year	$ 164.0
Remaining performance obligation, weighted average remaining life	3 years 10 months 24 days