Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	OPERATING REVENUE	OPERATING REVENUE	OPERATING REVENUE	OPERATING REVENUE
Lease revenue	$ 250	$ 254	$ 711	$ 780
Percent of operating revenue	8.00%	7.00%	7.00%	7.00%
Revenue recognized	$ 47	$ 44	$ 390	$ 391
Contract liabilities					$ 698	$ 715
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract term			1 year
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract term			5 years
Weighted Average | Mass Market Customers
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Length of customer life			50 months
Weighted Average | Business Customers
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Length of customer life			35 months