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Investment Securities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loan interest receivable	$ 40	$ 49
Securities gains and losses	0	$ 0	$ 0
Carrying value of securities pledged	15,600
Federal Reserve Bank Pledges	7,700
Pledged to the FHLB as collateral for potential future borrowings - investment securities	6,600
Collateral for potential future borrowings	1,300
Liabilities secured by pledged collateral	$ 702

X

- Definition

Federal Reserve Bank Pledges

+ References

No definition available.

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- Definition

Liabilities, primarily public and other deposits of state and local government agencies and derivative instruments, secured by pledged securities.

+ References

No definition available.

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- Definition

Pledged to the FHLB as collateral for potential future borrowings - investment securities

+ References

No definition available.

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X

- Definition

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SX 210.5-03(7)(c))
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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
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- Definition

Amount of liability associated with securities borrowed from entities in exchange for collateral.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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