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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% |  |  |  |

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