Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSR Portfolio and Related Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Down \| Derivative instrument hedges
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	$ 350	$ 325
Fair value 50 basis points change	168	147
Fair value 25 basis points change	82	69
Down \| Net sensitivity
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(7)	15
Fair value 50 basis points change	0	3
Fair value 25 basis points change	0	0
Down \| MSR portfolio
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(357)	(310)
Fair value 50 basis points change	(168)	(144)
Fair value 25 basis points change	(82)	(69)
Up \| Derivative instrument hedges
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(262)	(220)
Fair value 50 basis points change	(140)	(118)
Fair value 25 basis points change	(74)	(61)
Up \| Net sensitivity
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	5	(3)
Fair value 50 basis points change	6	2
Fair value 25 basis points change	2	2
Up \| MSR portfolio
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	267	217
Fair value 50 basis points change	146	120
Fair value 25 basis points change	$ 76	$ 63

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

Name:	us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of fifty basis points change in interest rates.

+ References

No definition available.

+ Details

Name:	usb_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfFiftyBasisPointsChangeInInterestRates
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of hundred basis points change in interest rates.

+ References

No definition available.

+ Details

Name:	usb_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfHundredBasisPointsChangeInInterestRates
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sensitivity analysis of fair value of interests continued to be held by transferor servicing assets or liabilities impact of twenty five basis points change in interest rates.

+ References

No definition available.

+ Details

Name:	usb_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfTwentyFiveBasisPointsChangeInInterestRates
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=usb_DownScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_DerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=usb_NetSensitivityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ServicingContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=usb_UpScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: