Business Combinations - Financial Results Included in the Consolidated Statement of Income (Details) - MUB $ in Millions	1 Months Ended
Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Net interest income	$ 255
Noninterest income	(38)
Net income (loss)	$ (562)

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
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-5

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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- Definition

Business combination pro forma information revenue net interest income of acquire since acquisition date actual.

+ References

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- Definition

Business combination pro forma information revenue noninterest income of acquire since acquisition date actual.

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