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Debt - ADT Notes (Details) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2021
Sep. 30, 2020
Oct. 31, 2019
Sep. 30, 2019
Aug. 31, 2020
ADT Notes due 2020 | Secured Debt          
Debt Instrument [Line Items]          
Debt instrument, repurchased face amount     $ 153 $ 147  
Repayments of senior debt     $ 155 $ 149  
ADT Notes due 2021          
Debt Instrument [Line Items]          
Interest Rate         6.25%
ADT Notes due 2021 | Secured Debt          
Debt Instrument [Line Items]          
Debt instrument, repurchased face amount   $ 1,000      
Repayments of senior debt   $ 1,100      
ADT Notes due 2022 | Secured Debt          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 1,000        
Interest Rate 3.50%        
Payment for debt extinguishment or debt prepayment cost $ 28        
Redemption price, maximum percentage 101.00%