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Affiliate Transactions - Additional Information (Details) - Affiliates
$ in Millions
6 Months Ended
Sep. 24, 2024
extension_period
Mar. 22, 2024
USD ($)
extension_period
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Related Party Transaction [Line Items]        
Notes receivable - affiliate     $ 2,668 $ 2,668
Lumen Technologies, Inc.        
Related Party Transaction [Line Items]        
Notes receivable - affiliate     2,700 2,700
Lumen Technologies, Inc. | Secured Revolving Credit Facility        
Related Party Transaction [Line Items]        
Notes receivable - affiliate     1,200 1,200
Lumen Technologies, Inc. | Unsecured Revolving Credit Facility        
Related Party Transaction [Line Items]        
Notes receivable - affiliate     $ 1,500 $ 1,500
Lumen Technologies, Inc. | Unsecured Debt | Unsecured Credit Facility        
Related Party Transaction [Line Items]        
Principal amount   $ 1,825    
Stated interest rate     10.30%  
Maturity period, number of extensions | extension_period 2      
Maturity period 1 year      
Basis spread on variable rate (as a percent)     6.00%  
Lumen Technologies, Inc. | Revolving Credit Facility        
Related Party Transaction [Line Items]        
Principal amount   $ 1,200    
Lumen Technologies, Inc. | Revolving Credit Facility | Line of Credit        
Related Party Transaction [Line Items]        
Stated interest rate   11.00%    
Maturity period, number of extensions | extension_period   2    
Maturity period   1 year