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Affiliate Transactions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 24, 2024
extension_period
Mar. 22, 2024
USD ($)
extension_period
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]              
Noncash distributions         $ 200 $ 0 $ 0
Affiliated Entity              
Related Party Transaction [Line Items]              
Note receivable - affiliate     $ 2,668   2,668 1,466  
Affiliated Entity | Lumen Technologies, Inc.              
Related Party Transaction [Line Items]              
Note receivable - affiliate     2,700   $ 2,700    
Distributions     1,400 $ 1,800      
Contributions       $ 210      
Noncash distributions     $ 200        
Affiliated Entity | Lumen Technologies, Inc. | Unsecured Debt | Unsecured Credit Facility              
Related Party Transaction [Line Items]              
Revolving credit facility capacity   $ 1,825          
Stated interest rate     11.03%   11.03%    
Number of extensions | extension_period 2            
Maturity period 1 year            
Basis spread on variable rate (as a percent)         6.00%    
Long-term debt, gross     $ 1,500   $ 1,500    
Affiliated Entity | Lumen Technologies, Inc. | Revolving Credit Facility              
Related Party Transaction [Line Items]              
Revolving credit facility capacity   $ 1,200 $ 1,200   $ 1,200 $ 1,500  
Affiliated Entity | Lumen Technologies, Inc. | Revolving Credit Facility | Line of Credit              
Related Party Transaction [Line Items]              
Stated interest rate   11.00%          
Number of extensions | extension_period   2          
Maturity period   1 year