Guarantees and Contingent Liabilities - Summary of Other Guarantees and Contingent Liabilities (Detail) $ in Millions	Dec. 31, 2016 USD ($)
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Carrying Amount	$ 61
Maximum Potential Future Payments	11,917
Third Party Borrowing Arrangements [Member]
Guarantor Obligations [Line Items]
Maximum Potential Future Payments	8
Securities Lending Indemnifications [Member]
Guarantor Obligations [Line Items]
Collateral Held	3,164
Maximum Potential Future Payments	3,083
Asset Sales [Member]
Guarantor Obligations [Line Items]
Carrying Amount	138
Maximum Potential Future Payments	6,211
Merchant Processing [Member]
Guarantor Obligations [Line Items]
Collateral Held	483
Carrying Amount	48
Maximum Potential Future Payments	91,040
Tender Option Bond Program Guarantee [Member]
Guarantor Obligations [Line Items]
Collateral Held	1,129
Maximum Potential Future Payments	1,114
Minimum Revenue Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Future Payments	9
Other Guarantees [Member]
Guarantor Obligations [Line Items]
Maximum Potential Future Payments	$ 1,287

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ Details

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

- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Guarantee obligations collateral held.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=usb_ThirdPartyBorrowingArrangementsMember
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- Details

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- Details

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- Details

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- Details

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- Details

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Data Type:	na
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- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_GuaranteeTypeOtherMember
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