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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Carrying And Fair Value Of Non-Variable Interest Rate Debt (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021 | Feb. 28, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 300
Carrying Value | $ 2,756 | $ 2,356 |  |
Term loan facility |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | 2,037 |  |  |
Term loan facility | 2019 Term Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | 330 | 330 |  |
Term loan facility | 2021 Term Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Line of credit, maximum borrowing capacity | 300 |  |  |
Carrying Value | 1,707 | 1,407 |  |
$4.125% Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | $ 337 | $ 337 |  |
$4.125% Senior Notes | APi Group DE, Inc |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Line of credit facility, interest rate | 4.125% | 4.125% | 4.125% |
$4.750% Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | $ 277 | $ 277 |  |
$4.750% Senior Notes | APi Group DE, Inc |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Line of credit facility, interest rate | 4.75% | 4.75% | 4.75% |
Level 2 | 2019 Term Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | $ 330 | $ 330 |  |
Fair Value | 330 | 331 |  |
Level 2 | 2021 Term Loan |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | 1,707 | 1,407 |  |
Fair Value | 1,711 | 1,407 |  |
Level 2 | Fixed Income Interest Rate | Senior Notes | $4.125% Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | 337 | 337 |  |
Fair Value | 302 | 305 |  |
Level 2 | Fixed Income Interest Rate | Senior Notes | $4.750% Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Carrying Value | 277 | 277 |  |
Fair Value | $ 254 | $ 257 |  |

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