AFS and HTM Debt Securities, Investment Grade Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale debt securities, at fair value	$ 222,873	$ 213,573
Available-for-sale, percent of investment grade	99.00%	99.00%
Held-to-maturity, amortized cost	$ 204,173	$ 208,118
Held-to-maturity, percent of investment grade	99.00%	99.00%
AFS and HTM Debt Securities Textual [Abstract]
Debt securities, held-to-maturity, credit quality indicator, update frequency [Extensible Enumeration]	Credit Quality Indicator, Updated Quarterly [Member]	Credit Quality Indicator, Updated Quarterly [Member]
Credit rating AA- and above [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Percentage of AFS and HTM debt securities with the same credit rating	99.00%	99.00%
Securities of U.S. Treasury and federal agencies [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale debt securities, at fair value	$ 202,509	$ 191,889
Available-for-sale, percent of investment grade	100.00%	100.00%
Held-to-maturity, amortized cost	$ 179,425	$ 182,679
Held-to-maturity, percent of investment grade	100.00%	100.00%
Securities of U.S. states and political subdivisions [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale debt securities, at fair value	$ 9,943	$ 10,397
Available-for-sale, percent of investment grade	99.00%	99.00%
Held-to-maturity, amortized cost	$ 17,411	$ 17,487
Held-to-maturity, percent of investment grade	100.00%	100.00%
Collateralized loan obligations [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale debt securities, at fair value	$ 8,205	$ 7,904
Available-for-sale, percent of investment grade	100.00%	100.00%
Held-to-maturity, amortized cost	$ 4,022	$ 4,660
Held-to-maturity, percent of investment grade	100.00%	100.00%
Collateralized loan obligations [Member] \| Credit rating AA- and above [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Percentage of AFS and HTM debt securities with the same credit rating	100.00%	100.00%
All other debt securities [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale debt securities, at fair value	$ 2,216	$ 3,383
Available-for-sale, percent of investment grade	89.00%	91.00%
Held-to-maturity, amortized cost	$ 3,315	$ 3,292
Held-to-maturity, percent of investment grade	59.00%	59.00%

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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- Definition

Indicates frequency of update of credit quality indicator for investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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Percentage of fair value of available-for-sale debt securities determined by those rated investment grade, inclusive of those based on internal credit grades.

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Percentage of amortized cost of held-to-maturity debt securities determined by those rated investment grade, inclusive of those based on internal credit grades.

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Percentage of AFS and HTM debt securities with the same credit rating

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