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Trust Assets, Escrow and Other Deposits (Narrative) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other Assets [Line Items]
Escrow deposits	$ 14,000	$ 10,800
Like-kind exchange funds	5,200	6,000
Cash deposits with third party financial institutions	865	433
First American Trust
Other Assets [Line Items]
Escrow deposits	5,800	4,800
Assets held-in-trust	$ 4,100	$ 4,600

X

- Definition

Total amount of cash deposits, which are held at third-party financial institutions.

+ References

No definition available.

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X

- Definition

Like kind exchange funds.

+ References

No definition available.

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X

- Definition

Other assets.

+ References

No definition available.

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X

- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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Balance Type:	debit
Period Type:	instant

X

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 440
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=6491277&loc=d3e6429-115629

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Balance Type:	debit
Period Type:	instant

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- Details

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