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Commitments and Contingencies - Tax Credit and Equity Investments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Investments in affordable housing projects
Tax Credit and Certain Equity Investments
Carrying amount	$ 8,655	$ 8,049
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]	Other assets (including $1,841 and $1,725 at fair value, respectively)	Other assets (including $1,841 and $1,725 at fair value, respectively)
Amount of future funding commitments included in carrying amount	$ 2,449	$ 2,531
Lending exposure	2,203	2,341
Renewable Energy Investments
Tax Credit and Certain Equity Investments
Carrying amount	895	736
Amount of future funding commitments not included in carrying amount	1,071	719
SBIC and certain other equity method investments:
Tax Credit and Certain Equity Investments
Carrying amount	1,173	1,015
Amount of future funding commitments not included in carrying amount	$ 615	$ 626

X

- Definition

Lending commitments to Affordable Housing Projects

+ References

No definition available.

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- Definition

Amount of investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under program not meeting condition for accounting under proportional amortization method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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- Definition

Indicates line item in statement of financial position that includes investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

+ References

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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

No definition available.

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Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method.

+ References

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