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Debt - Debt to Affiliates - Commitment Letter (Details) - Sprint - USD ($)
Sep. 06, 2019
Dec. 31, 2019
Sep. 07, 2019
Debt Instrument [Line Items]      
Required fees by acquirer upon consummation   $ 0  
Secured and Unsecured Debt Financing      
Debt Instrument [Line Items]      
Financing commitment, amount $ 30,000,000,000.0    
Secured and Unsecured Debt Financing | Scenario One      
Debt Instrument [Line Items]      
Payments of consent fees 340,000,000    
Required fees by acquirer upon consummation   $ 12,000,000  
Secured Revolving Credit Facility      
Debt Instrument [Line Items]      
Financing commitment, amount 4,000,000,000.0    
Secured Term Loan Facility      
Debt Instrument [Line Items]      
Financing commitment, amount 7,000,000,000.0   $ 4,000,000,000.0
Secured Bridge Loan Facility      
Debt Instrument [Line Items]      
Financing commitment, amount $ 19,000,000,000.0