v3.20.2
Debt - Notes Redemptions and Repayments (Details) - USD ($)
6 Months Ended
Jul. 04, 2020
Apr. 09, 2020
Jun. 30, 2020
Jun. 30, 2019
Aug. 31, 2020
Apr. 01, 2020
Debt Instrument [Line Items]            
Principal Amount     $ 2,704,000,000      
Write off of Premiums, Discounts and Issuance Costs       $ 0    
Other       0    
Sprint            
Debt Instrument [Line Items]            
Senior notes     29,035,000,000      
Affiliates            
Debt Instrument [Line Items]            
Principal Amount     27,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     210,000,000      
Other     (47,000,000)      
Bridge Loan            
Debt Instrument [Line Items]            
Principal Amount     19,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     251,000,000      
Other     (47,000,000)      
Secured bridge loan facility due 2021            
Debt Instrument [Line Items]            
Other   $ (71,000,000)        
Secured bridge loan facility due 2021 | Sprint            
Debt Instrument [Line Items]            
Financing commitment, amount           $ 19,000,000,000.0
Secured bridge loan facility due 2021 | Bridge Loan            
Debt Instrument [Line Items]            
Principal Amount     19,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     251,000,000      
Other     $ (47,000,000)      
Redemption Price (as a percent)     100.00%      
5.300% Senior Notes due 2021 | Affiliates | Senior Notes            
Debt Instrument [Line Items]            
Interest rate, stated percentage     5.30%      
Principal Amount     $ 2,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     0      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
6.000% Senior Notes to affiliates due 2024 | Affiliates | Senior Notes            
Debt Instrument [Line Items]            
Interest rate, stated percentage     6.00%      
Principal Amount     $ 1,350,000,000      
Write off of Premiums, Discounts and Issuance Costs     (26,000,000)      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
6.000% Senior Notes to affiliates due 2024 | Affiliates | Senior Notes            
Debt Instrument [Line Items]            
Interest rate, stated percentage     6.00%      
Principal Amount     $ 650,000,000      
Write off of Premiums, Discounts and Issuance Costs     (15,000,000)      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
Incremental term loan facility to affiliates due 2022 | Affiliates            
Debt Instrument [Line Items]            
Principal Amount     $ 2,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     0      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
Incremental term loan facility to affiliates due 2024 | Affiliates            
Debt Instrument [Line Items]            
Principal Amount     $ 2,000,000,000.0      
Write off of Premiums, Discounts and Issuance Costs     0      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
Total of Senior Notes and Incremental term loan facilities to affiliates redeemed | Affiliates            
Debt Instrument [Line Items]            
Principal Amount     $ 8,000,000,000      
Write off of Premiums, Discounts and Issuance Costs     (41,000,000)      
Other     0      
Accounts receivable facility            
Debt Instrument [Line Items]            
Principal Amount     2,310,000,000      
Write off of Premiums, Discounts and Issuance Costs     0      
Other     $ 0      
Redemption Price (as a percent)     100.00%      
Accounts receivable facility | Sprint            
Debt Instrument [Line Items]            
Senior notes     $ 0      
Senior Secured Series 2016-1 A-1 Notes due 2021, 3.360% | Senior Notes            
Debt Instrument [Line Items]            
Interest rate, stated percentage     3.36%      
Principal Amount     $ 219,000,000      
Write off of Premiums, Discounts and Issuance Costs     0      
Other     0      
Senior Secured Series 2016-1 A-1 Notes due 2021, 3.360% | Senior Notes | Sprint            
Debt Instrument [Line Items]            
Interest rate, stated percentage           336.00%
Senior notes     1,092,000,000      
Other debt            
Debt Instrument [Line Items]            
Principal Amount     175,000,000      
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0    
Other debt | Sprint            
Debt Instrument [Line Items]            
Senior notes     $ 353,000,000      
6.500% Senior Notes due 2024 | Senior Notes | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate, stated percentage 650.00%          
Principal Amount $ 1,000,000,000.0          
Redemption Price (as a percent) 102.17%          
Redemption premium $ 22,000,000          
Write-off of issuance costs $ 12,000,000          
5.125% Senior Notes due 2021 | Affiliates | Senior Notes | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate, stated percentage 5.125%          
Principal Amount $ 1,250,000,000          
Due to affiliates $ 1,250,000,000          
6.375% Senior Notes due 2025 | Senior Notes | Subsequent Event            
Debt Instrument [Line Items]            
Interest rate, stated percentage         637.50%  
Senior notes         $ 1,700,000,000