Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income attributable to U.S. Bancorp	$ 2,753	$ 2,249
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	951	1,327
Depreciation and amortization of premises and equipment	140	128
Amortization of intangibles	141	150
Provision for deferred income taxes	(26)	295
(Gain) loss on sales of loans held for sale	(1,210)	(131)
(Gains) loss on sales of securities and other assets	(80)	(5)
Loans originated for sale in the secondary market, net of repayments	(39,559)	(19,156)
Proceeds from sales of loans held for sale	39,115	23,891
Other, net	1,403	61
Net cash provided by operating activities	3,628	8,809
Investing Activities
Proceeds from sales of available-for-sale investment securities	345	437
Proceeds from maturities of held-to-maturity investment securities	2,012	381
Proceeds from maturities of available-for-sale investment securities	7,889	5,312
Purchases of held-to-maturity investment securities	(6,096)	(11,872)
Purchases of available-for-sale investment securities	(6,861)	(5,750)
Net increase in loans outstanding	(6,487)	(3,026)
Proceeds from sales of loans	561	375
Purchases of loans	(1,472)	(1,193)
Acquisitions, net of cash acquired	94	650
Other, net	(259)	(620)
Net cash used in investing activities	(10,274)	(15,306)
Financing Activities
Net increase in deposits	10,183	8,844
Net increase (decrease) in short-term borrowings	215	(3,019)
Proceeds from issuance of long-term debt	2,620	1,534
Principal payments or redemption of long-term debt	(5,736)	(484)
Proceeds from issuance of preferred stock	2,163	676
Proceeds from issuance of common stock	191	104
Repurchase of common stock	(863)
Cash dividends paid on preferred stock	(76)	(58)
Cash dividends paid on common stock	(610)	(337)
Net cash provided by (used in) financing activities	8,087	7,260
Change in cash and due from banks	1,441	763
Cash and due from banks at beginning of period	13,962	14,487
Cash and due from banks at end of period	$ 15,403	$ 15,250