Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Amortized Cost	$ 71,652	$ 73,833
Asset Pledged as Collateral
Derivative [Line Items]
Pledged securities	$ 36,759	$ 48,058
Max
Derivative [Line Items]
Risk Participation Agreement Terms	9 years
Min
Derivative [Line Items]
Risk Participation Agreement Terms	1 year
Cash flow hedges
Derivative [Line Items]
Estimated portion of net after-tax gain (loss) on active and terminated hedges to be reclassified from AOCI into earnings during the next 12 months	$ (173)

Risk Participation Agreement Terms

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- Definition

Amortized cost of 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 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
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- Definition

Amount of investment in marketable security.

+ References

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-Name Accounting Standards Codification
-Section S99
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