Guarantees and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
USB Capital, IX, a wholly-owned unconsolidated trust
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	$ 685
Percentage of common equity in wholly owned USB Capital IX	100.00%
Assets held in trust	$ 686
Operations of subsidiaries
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	2,000
Standby letters of credit
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	$ 10,999
Term of guaranteed obligations	16 months
Fair value of guaranteed obligations	$ 20
Collateral held for guaranteed obligations	0
Third party borrowing arrangements
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	5
Fair value of guaranteed obligations	0
Collateral held for guaranteed obligations	0
Securities lending indemnifications
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	6,679
Fair value of guaranteed obligations	0
Collateral held for guaranteed obligations	6,924
Asset sales
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	10,263
Fair value of guaranteed obligations	106
Collateral held for guaranteed obligations	0
Syndication of tax-advantaged investments
Guarantor Obligations [Line Items]
Fair value of guaranteed obligations	93
Representation and warranty
Guarantor Obligations [Line Items]
Fair value of guaranteed obligations	13	$ 17
Unresolved claims	18	$ 39
Merchant processing
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	140,288
Fair value of guaranteed obligations	71
Collateral held for guaranteed obligations	815
Airline processing arrangements
Guarantor Obligations [Line Items]
Fair value of guaranteed obligations	50
Value of airline tickets purchased to deliver at future date through card transactions	13,100
Airline processing arrangements \| Escrow deposits letters of credit and indemnities
Guarantor Obligations [Line Items]
Collateral held for guaranteed obligations	679
Unresolved merchant charge-backs
Guarantor Obligations [Line Items]
Fair value of guaranteed obligations	21
Unresolved merchant charge-backs \| Merchant escrow deposits
Guarantor Obligations [Line Items]
Collateral held for guaranteed obligations	135
Tender option bond program guarantee
Guarantor Obligations [Line Items]
Maximum potential future payments guaranteed	589
Fair value of guaranteed obligations	0
Collateral held for guaranteed obligations	$ 607

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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Balance Type:	debit
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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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/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- Definition

Guarantee obligations collateral held.

+ References

No definition available.

+ Details

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- Definition

Guarantor Obligations, Term

+ References

No definition available.

+ Details

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- Definition

Interest in unconsolidated trusts.

+ References

No definition available.

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Balance Type:	na
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- Definition

Loss contingency pending claims amount.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Value of airline tickets purchased to deliver at future date through card transactions.

+ References

No definition available.

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- Details

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- Details

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