Background and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 25, 2019
Accounting Policies [Line Items]
Advertising expense	$ 87	$ 62	$ 56
Book overdrafts	$ 0	$ 0
Accounts receivable, period past due (in days)	30 days
Unissued shares of century link common stock (in shares)	11,000,000
Preferred stock dividends (in dollars per share)	$ 25
Number of shares issued per share of common stock				1
Capitalized Software
Accounting Policies [Line Items]
Estimated useful life (in years)	7 years
Minimum
Accounting Policies [Line Items]
Contract term (in years)	1 year
Minimum | Customer Relationships
Accounting Policies [Line Items]
Estimated useful life (in years)	7 years
Minimum | Other Intangible Assets
Accounting Policies [Line Items]
Estimated useful life (in years)	9 years
Maximum
Accounting Policies [Line Items]
Contract term (in years)	5 years
Customer relationship period for revenue recognition (in years)	20 years
Maximum | Customer Relationships
Accounting Policies [Line Items]
Estimated useful life (in years)	14 years
Maximum | Other Intangible Assets
Accounting Policies [Line Items]
Estimated useful life (in years)	20 years
Weighted Average | Mass Markets
Accounting Policies [Line Items]
Length of customer life (in months)	36 months
Weighted Average | Business
Accounting Policies [Line Items]
Length of customer life (in months)	33 months