Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net income attributable to U.S. Bancorp	$ 1,338	$ 1,046
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	481	755
Depreciation and amortization of premises and equipment	69	62
Amortization of intangibles	71	75
Provision for deferred income taxes	73	(50)
Gain on sales of securities and other assets, net	(1,049)	(149)
Loans originated for sale in the secondary market, net of repayments	(18,301)	(11,327)
Proceeds from sales of loans held for sale	20,869	15,551
Other, net	(460)	265
Net cash provided by operating activities	3,091	6,228
Investing Activities
Proceeds from sales of available-for-sale investment securities	200	141
Proceeds from maturities of held-to-maturity investment securities	810	102
Proceeds from maturities of available-for-sale investment securities	4,045	3,189
Purchases of held-to-maturity investment securities	(3,451)	(6,524)
Purchases of available-for-sale investment securities	(4,738)	(3,896)
Net increase in loans outstanding	(2,117)	(672)
Proceeds from sales of loans	192	234
Purchases of loans	(783)	(581)
Acquisitions, net of cash acquired	108	650
Other, net	(48)	(131)
Net cash used in investing activities	(5,782)	(7,488)
Financing Activities
Net increase in deposits	2,420	2,254
Net decrease in short-term borrowings	(3,015)	(1,652)
Proceeds from issuance of long-term debt	1,085	370
Principal payments or redemption of long-term debt	(2,679)	(378)
Proceeds from issuance of preferred stock	1,088
Proceeds from issuance of common stock	98	94
Repurchase of common stock	(438)
Cash dividends paid on preferred stock	(30)	(19)
Cash dividends paid on common stock	(239)	(96)
Net cash provided by (used in) financing activities	(1,710)	573
Change in cash and due from banks	(4,401)	(687)
Cash and due from banks at beginning of period	13,962	14,487
Cash and due from banks at end of period	$ 9,561	$ 13,800