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Goodwill, Customer Relationships and Other Intangible Assets - Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Goodwill [Line Items]      
Goodwill $ 0   $ 1,964
Indefinite-lived intangible assets 0   9
Total other intangible assets, net 4,411   4,806
Held for sale | Mass Markets Fiber-to-the Home Business      
Goodwill [Line Items]      
Goodwill 1,336    
Customer Relationships      
Goodwill [Line Items]      
Other intangible assets subject to amortization 2,750   3,196
Accumulated amortization 4,796   4,504
Capitalized Software      
Goodwill [Line Items]      
Other intangible assets subject to amortization 1,599   1,529
Accumulated amortization 3,853   4,067
Patents and Other      
Goodwill [Line Items]      
Other intangible assets subject to amortization 62   72
Accumulated amortization $ 96   $ 86
Fully Amortized and Retired Customer Relationships      
Goodwill [Line Items]      
Gross carrying value   $ 161  
Fully Amortized and Retired Capitalized Software      
Goodwill [Line Items]      
Gross carrying value   $ 211