Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Notes payable, aggregate fair value	$ 1,160	$ 1,100
Notes payable, principal balance	$ 1,380
Debt outstanding with fixed-rate		$ 1,370

Fair value portion of notes payable.

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

SAUL CENTERS, INC. 10-Q