v3.22.0.1
Income Taxes - Narrative (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Apr. 01, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]        
Indirect tax effects excluded $ 132,000,000      
Federal and state tax credits 404,000,000 $ 411,000,000    
Deferred Tax Assets, Valuation Allowance (435,000,000) (878,000,000)   $ (129,000,000)
Unrecognized tax benefits that would impact effective tax rate 932,000,000 $ 857,000,000   $ 310,000,000
Sprint        
Valuation Allowance [Line Items]        
Deferred tax assets     $ 851,000,000  
Federal        
Valuation Allowance [Line Items]        
Unrecognized tax benefits, net operating loss 3,500,000,000      
Operating loss carryforwards 221,000,000      
Federal | Research Tax Credit Carryforward        
Valuation Allowance [Line Items]        
Federal and state tax credits 581,000,000      
State        
Valuation Allowance [Line Items]        
Unrecognized tax benefits, net operating loss 1,400,000,000      
Operating loss carryforwards 473,000,000      
Foreign Tax Authority        
Valuation Allowance [Line Items]        
Unrecognized tax benefits, net operating loss 37,000,000      
Operating loss carryforwards $ 0