v3.25.4

Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification of interest rate derivative (gain) loss to net income (loss)	$ 4,038,000	$ 15,464,000	$ 25,823,000
Cash flow hedge gain (loss) to be reclassified within 12 months	2,900,000
(Loss) gain on derivative instruments, net	(2,824,000)	$ 11,235,000	$ 16,742,000
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding derivatives	0
Aggregate notional amount	1,000,000,000.0
Designated as Hedging Instrument \| Favorable Interest Rates
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	834,500,000
Designated as Hedging Instrument \| Four Interest Rates
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	1,800,000,000
Designated as Hedging Instrument \| Two Interest Rates
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	150,000,000.0
Designated as Hedging Instrument \| Three Interest Rates
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	345,200,000
Designated as Hedging Instrument \| Interest rate caps - net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 1,000,000,000.0

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Nominal or face amount used to calculate payments on the derivative asset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Apartment Income REIT, L.P. 10-K