Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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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.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Investment Securities - Allowance for Credit Losses for HTM Securities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Held-to-maturity securities, allowance for credit losses	$ 6	$ 6	$ 6	$ 7	$ 5	$ 1
Held-to-maturity securities, (reduction of) provision for credit losses,	$ 1	(1)	$ 6
Held-to-maturity, accrued interest receivable		294		171
Accrued interest receivable and other assets \| Held-to-maturity Securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Held-to-maturity, accrued interest receivable		205		225
Municipal bonds and notes
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Held-to-maturity securities, allowance for credit losses		1		1
Corporate bonds
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Held-to-maturity securities, allowance for credit losses		$ 5		$ 6