v3.20.4
Debt - Redemptions and Repayments (Details) - USD ($)
12 Months Ended
Sep. 01, 2020
Jul. 04, 2020
Apr. 09, 2020
Dec. 31, 2020
Aug. 15, 2020
Apr. 01, 2020
Debt Instrument [Line Items]            
Principal Amount       $ 9,450,000,000    
Principal Amount       30,447,000,000    
Write off of Premiums, Discounts and Issuance Costs       10,000,000    
Write off of Premiums, Discounts and Issuance Costs       351,000,000    
Other       58,000,000    
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)    
6.500% Senior Notes due 2024            
Debt Instrument [Line Items]            
Interest rate, stated percentage       6.50%    
6.375% Senior Notes due 2025            
Debt Instrument [Line Items]            
Interest rate, stated percentage       6.375%    
5.300% Senior Notes due 2021 | Affiliates            
Debt Instrument [Line Items]            
Interest rate, stated percentage       5.30%    
5.125% Senior Notes Due 2025            
Debt Instrument [Line Items]            
Interest rate, stated percentage       5.125%    
5.125% Senior Notes Due 2025 | Affiliates            
Debt Instrument [Line Items]            
Interest rate, stated percentage   5.125%        
Incremental term loan facility to affiliates due 2022 | Affiliates            
Debt Instrument [Line Items]            
Principal Amount       $ 2,000,000,000   $ 2,000,000,000.0
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0    
Redemption Price (as a percent)       1.00%    
Incremental term loan facility to affiliates due 2024 | Affiliates            
Debt Instrument [Line Items]            
Principal Amount       $ 2,000,000,000   2,000,000,000.0
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0    
Redemption Price (as a percent)       1.00%    
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)       1.00%    
Secured Bridge Loan Facility            
Debt Instrument [Line Items]            
Other     $ 71,000,000      
Secured Bridge Loan Facility | Sprint            
Debt Instrument [Line Items]            
Financing commitment, amount     $ 19,000,000,000.0     $ 19,000,000,000.0
Secured Bridge Loan Facility | 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)       1.00128%    
Senior Secured Series 2016-1 A-1 Notes due 2021, 3.360% | Sprint            
Debt Instrument [Line Items]            
Interest rate, stated percentage           3.36%
Secured Term Loan Facility due 2027            
Debt Instrument [Line Items]            
Principal Amount       $ 4,000,000,000    
Write off of Premiums, Discounts and Issuance Costs       100,000,000    
Other       $ 0    
Redemption Price (as a percent)       1.00%    
Other debt            
Debt Instrument [Line Items]            
Principal Amount       $ 481,000,000    
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0    
Senior Notes | 6.500% Senior Notes due 2024            
Debt Instrument [Line Items]            
Interest rate, stated percentage   6.50%   6.50%    
Principal Amount       $ 1,000,000,000    
Principal Amount   $ 1,000,000,000.0        
Write off of Premiums, Discounts and Issuance Costs       12,000,000    
Other       $ 22,000,000    
Redemption Price (as a percent)   102.167%   102.167%    
Redemption premium   $ 22,000,000        
Write-off of issuance costs   $ 12,000,000        
Senior Notes | Senior Notes due 2020, 7.000%            
Debt Instrument [Line Items]            
Interest rate, stated percentage         7.00%  
Principal Amount       $ 1,500,000,000    
Principal Amount         $ 1,500,000,000  
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0    
Senior Notes | Senior Notes due 2020, 7.000% | Sprint            
Debt Instrument [Line Items]            
Interest rate, stated percentage           7.00%
Senior Notes | 6.375% Senior Notes due 2025            
Debt Instrument [Line Items]            
Interest rate, stated percentage 6.375%     6.375%    
Principal Amount       $ 1,700,000,000    
Principal Amount $ 1,700,000,000          
Write off of Premiums, Discounts and Issuance Costs       24,000,000    
Other       $ 36,000,000    
Redemption Price (as a percent) 102.125%     102.125%    
Write-off of issuance costs $ 24,000,000          
Senior Notes | Total Senior Notes to third parties redeemed            
Debt Instrument [Line Items]            
Principal Amount       $ 4,200,000,000    
Write off of Premiums, Discounts and Issuance Costs       36,000,000    
Other       $ 58,000,000    
Senior Notes | 5.300% Senior Notes due 2021 | Affiliates            
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%    
Senior Notes | 6.000% Senior Notes due 2024 | Affiliates            
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%    
Senior Notes | 6.000% Senior Notes due 2024 | Affiliates            
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%    
Senior Notes | 5.125% Senior Notes Due 2025 | Affiliates            
Debt Instrument [Line Items]            
Interest rate, stated percentage       5.125%    
Principal Amount       $ 1,250,000,000    
Write off of Premiums, Discounts and Issuance Costs       15,000,000    
Other       $ 0    
Redemption Price (as a percent)       100.00%    
Senior Notes | Total Senior Notes to affiliates redeemed | Affiliates            
Debt Instrument [Line Items]            
Principal Amount       $ 5,250,000,000    
Write off of Premiums, Discounts and Issuance Costs       (26,000,000)    
Other       $ 0    
Senior Notes | Senior Secured Series 2016-1 A-1 Notes due 2021, 3.360%            
Debt Instrument [Line Items]            
Interest rate, stated percentage       3.36%    
Principal Amount       $ 656,000,000    
Write off of Premiums, Discounts and Issuance Costs       0    
Other       $ 0