Fair Value Inputs Credit Valuation Adjustment As A Percentage Of Derivative Contract

No definition available.

Name:	usb_FairValueInputsCreditValuationAdjustmentAsPercentageOfDerivativeContract
Namespace Prefix:	usb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value measurement transfers from one level to another.

+ References

No definition available.

+ Details

Name:	usb_FairValueMeasurementTransfersFromOneLevelToAnother
Namespace Prefix:	usb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

+ Details

Name:	us-gaap_FairValueOptionChangesInFairValueGainLoss1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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/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

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

Fair Values of Assets and Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Standby Letters of Credit and Unfunded Commitments [Member]	Dec. 31, 2013 Standby Letters of Credit and Unfunded Commitments [Member]	Mar. 31, 2014 Other Guarantees [Member]	Dec. 31, 2013 Other Guarantees [Member]	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Average [Member]
Fair Value Disclosures [Abstract]
Fair value measurement transfers from one level to another	$ 0	$ 0
Mortgage loans held for sale measured at fair value gain (loss)	52	(175)
Assumed credit valuation adjustment as percentage of underlying fair value of underlying derivative contracts							0.00%	100.00%	7.00%
Carrying value of guarantee obligations			$ 399	$ 382	$ 275	$ 278