AFS and HTM Debt Securities, Investment Grade Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale, at fair value	$ 168,436	$ 177,244
Available-for-sale, percent of investment grade	99.00%	99.00%
Held-to-maturity, amortized cost	$ 280,892	$ 272,118
Held-to-maturity, percent of investment grade	99.00%	99.00%
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	98.00%	98.00%
Securities of U.S. Treasury and federal agencies [Member]
Available For Sale And Held To Maturity Debt Securities Credit Ratings [Abstract]
Available-for-sale, at fair value	$ 137,870	$ 145,547
Available-for-sale, percent of investment grade	100.00%	100.00%
Held-to-maturity, amortized cost	$ 214,462	$ 205,453
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, at fair value	$ 16,486	$ 16,917
Available-for-sale, percent of investment grade	99.00%	99.00%
Held-to-maturity, amortized cost	$ 32,984	$ 32,704
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, at fair value	$ 5,197	$ 5,708
Available-for-sale, percent of investment grade	100.00%	100.00%
Held-to-maturity, amortized cost	$ 30,518	$ 31,128
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, at fair value	$ 8,883	$ 9,072
Available-for-sale, percent of investment grade	89.00%	88.00%
Held-to-maturity, amortized cost	$ 2,928	$ 2,833
Held-to-maturity, percent of investment grade	62.00%	64.00%

Amount 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
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Amount, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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 AFS and HTM debt securities with the same credit rating

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