Recently Completed Divestiture of the Latin American Business and Planned Divestiture of ILEC Businesses - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Aug. 03, 2021	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization			$ 1,635	$ 2,191
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt, net of discounts		$ 1,395	1,395		$ 1,377
Depreciation and amortization		163	333
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			0
Disposal Group, Held-for-sale, Not Discontinued Operations | Embarq | Senior notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt, net of discounts	$ 1,400	1,400	1,400		1,400
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt, net of discounts		0	0		0
Depreciation and amortization		48	97
Disposal Group, Held-for-sale, Not Discontinued Operations | ILEC Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration from disposal of business	7,500
Long-term debt, net of discounts		1,395	1,395		$ 1,377
Purchaser's transaction expenses	$ 1,700
Depreciation and amortization		$ 115	$ 236