Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income attributable to U.S. Bancorp	$ 5,851us-gaap_NetIncomeLoss	$ 5,836us-gaap_NetIncomeLoss	$ 5,647us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	1,229	1,340	1,882
Depreciation and amortization of premises and equipment	302us-gaap_DepreciationNonproduction	297us-gaap_DepreciationNonproduction	287us-gaap_DepreciationNonproduction
Amortization of intangibles	199us-gaap_AmortizationOfIntangibleAssets	223us-gaap_AmortizationOfIntangibleAssets	274us-gaap_AmortizationOfIntangibleAssets
(Gain) loss on sale of loans held for sale	(801)usb_GainLossOnSaleOfLoansHeldForSale	(1,044)usb_GainLossOnSaleOfLoansHeldForSale	(2,889)usb_GainLossOnSaleOfLoansHeldForSale
(Gain) loss on sale of securities and other assets	(595)us-gaap_GainLossOnSaleOfOtherAssets	(74)us-gaap_GainLossOnSaleOfOtherAssets	(242)us-gaap_GainLossOnSaleOfOtherAssets
Loans originated for sale in the secondary market, net of repayments	(30,858)	(56,698)	(81,219)
Proceeds from sales of loans held for sale	29,962	61,681	82,302
Other, net	43	(115)	1,916
Net cash provided by operating activities	5,332	11,446	7,958
Investing Activities
Proceeds from sales of available-for-sale investment securities	475	947	2,060
Proceeds from maturities of held-to-maturity investment securities	9,479	8,587	6,336
Proceeds from maturities of available-for-sale investment securities	7,212	10,147	15,374
Purchases of held-to-maturity investment securities	(15,597)	(13,218)	(10,247)
Purchases of available-for-sale investment securities	(21,752)	(13,146)	(16,605)
Net increase in loans outstanding	(12,873)	(12,331)	(15,158)
Proceeds from sales of loans	1,657	819	1,895
Purchases of loans	(2,355)	(2,468)	(2,741)
Acquisitions, net of cash acquired	3,436	(58)	94
Other, net	506	(303)	(1,261)
Net cash (used in) provided by financing activities	(29,812)	(21,024)	(20,253)
Financing Activities
Net increase in deposits	15,822us-gaap_IncreaseDecreaseInDeposits	12,940us-gaap_IncreaseDecreaseInDeposits	18,050us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term borrowings	2,285	1,306	(4,167)
Proceeds from issuance of long-term debt	16,394	2,041	4,966
Principal payments or redemption of long-term debt	(4,128)us-gaap_RepaymentsOfLongTermDebt	(2,883)us-gaap_RepaymentsOfLongTermDebt	(11,415)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of preferred stock		487	2,163
Proceeds from issuance of common stock	453	524	395
Redemption of preferred stock		(500)
Repurchase of common stock	(2,200)	(2,282)	(1,856)
Cash dividends paid on preferred stock	(243)	(254)	(204)
Cash dividends paid on common stock	(1,726)us-gaap_PaymentsOfDividendsCommonStock	(1,576)us-gaap_PaymentsOfDividendsCommonStock	(1,347)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	26,657	9,803	6,585
Change in cash and due from banks	2,177us-gaap_CashPeriodIncreaseDecrease	225us-gaap_CashPeriodIncreaseDecrease	(5,710)us-gaap_CashPeriodIncreaseDecrease
Cash and due from banks at beginning of period	8,477us-gaap_CashAndDueFromBanks	8,252us-gaap_CashAndDueFromBanks	13,962us-gaap_CashAndDueFromBanks
Cash and due from banks at end of period	10,654us-gaap_CashAndDueFromBanks	8,477us-gaap_CashAndDueFromBanks	8,252us-gaap_CashAndDueFromBanks
Supplemental Cash Flow Disclosures
Cash paid for income taxes	748us-gaap_IncomeTaxesPaid	812us-gaap_IncomeTaxesPaid	1,469us-gaap_IncomeTaxesPaid
Cash paid for interest	1,476us-gaap_InterestPaid	1,759us-gaap_InterestPaid	2,218us-gaap_InterestPaid
Net noncash transfers to foreclosed property	199us-gaap_TransferToOtherRealEstate	323us-gaap_TransferToOtherRealEstate	564us-gaap_TransferToOtherRealEstate
Noncash transfer of investment securities available-for-sale to held-to-maturity			11,705
Acquisitions
Assets (sold) acquired	1,376	126	194
Liabilities sold (assumed)	(4,797)	(24)	(260)
Net	$ (3,421)	$ 102	$ (66)

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Non cash transfer of investment securities available for sale to held to maturity.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Amount of increase (decrease) in cash. Cash is the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Includes effect from exchange rate changes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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