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Long-Term Debt and Note Payable - Affiliate - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 15, 2020	Dec. 31, 2019	Sep. 30, 2017	Apr. 18, 2012
Long-term debt
Net loss on early retirement of debt	$ 12,000,000	$ 0
Note payable - affiliate	1,100,000,000			$ 1,069,000,000
Interest	$ 49,000,000			55,000,000
Note payable - affiliate | Affiliated entity
Long-term debt
Stated interest rate	5.561%
Note payable - affiliate	$ 1,100,000,000			$ 1,069,000,000
Note payable - affiliate | Qwest Corporation | Affiliated entity
Long-term debt
Debt instrument, face amount					$ 965,000,000	$ 1,000,000,000.0
Weighted average interest rate	5.561%
Interest costs capitalized	$ 136,000,000
Interest	15,000,000
6.875% Notes Due 2033 | Senior notes
Long-term debt
Repurchased face amount			$ 850,000,000
Stated interest rate			6.875%
7.125% Notes Due 2043 | Senior notes
Long-term debt
Repurchased face amount			$ 250,000,000
Stated interest rate			7.125%
Net loss on early retirement of debt	$ 12,000,000

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