Business Combinations - Purchase Price of PCD Loans Acquired (Details) - MUB - PCD Loans $ in Millions	Dec. 01, 2022 USD ($)
Business Acquisition [Line Items]
Principal balance	$ 5,097
Allowance for credit losses at acquisition	(463)
Non-credit discount	(213)
Purchase price	$ 4,421

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount at par value of financing receivable purchased with credit deterioration.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount at purchase price of financing receivable purchased with credit deterioration.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

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Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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