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LEASES - Schedule of Net Investment In Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Leases [Abstract]
Lease receivables	$ 1,827	$ 1,764
Unguaranteed residual assets	209	235
Total net investment in finance leases	2,036	1,999
Leveraged lease net investment	17	15
Total	2,053	2,014
Leveraged lease, non-recourse debt	$ 1	$ 2

X

- Definition

Financing Lease, Net Investment in Lease, Including Leveraged Lease

+ References

No definition available.

+ Details

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Namespace Prefix:	fcnca_
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Period Type:	instant

X

- Definition

Leveraged Lease, Non-recourse Debt

+ References

No definition available.

+ Details

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X

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term, guaranteed by lessee or other third party unrelated to lessor, from direct financing lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-6

+ Details

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Period Type:	instant

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of net investment in direct financing lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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X

- Definition

Present value expected to be derived from underlying asset, following end of lease term, not guaranteed by lessee or other third party unrelated to lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-6

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- References

No definition available.

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X

- Definition

The net investment in arrangements meeting the criteria for classification as leveraged leases including deferred taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479711/842-50-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 30
-Name Accounting Standards Codification
-Section 30
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481274/840-30-30-14

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