Consolidated Statement of Cash Flows [Unaudited] (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net income attributable to U.S. Bancorp	$ 1,428	$ 1,338
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	403	481
Depreciation and amortization of premises and equipment	74	69
Amortization of intangibles	57	71
Provision for deferred income taxes	10	73
(Gain) loss on sale of loans held for sale	(479)	(628)
(Gain) loss on sale of securities and other assets	5	(28)
Loans originated for sale in the secondary market, net of repayments	(20,477)	(18,548)
Proceeds from sales of loans held for sale	21,063	20,723
Other, net	(416)	(460)
Net cash provided by operating activities	1,668	3,091
Investing Activities
Proceeds from sales of available-for-sale investment securities	166	200
Proceeds from maturities of held-to-maturity investment securities	2,425	810
Proceeds from maturities of available-for-sale investment securities	3,203	4,045
Purchases of held-to-maturity investment securities	(2,776)	(3,451)
Purchases of available-for-sale investment securities	(3,925)	(4,738)
Net increase in loans outstanding	(317)	(2,117)
Proceeds from sales of loans	285	192
Purchases of loans	(727)	(783)
Acquisitions, net of cash acquired		108
Other, net	142	(48)
Net cash used in investing activities	(1,524)	(5,782)
Financing Activities
Net increase (decrease) in deposits	(1,171)	2,420
Net increase (decrease) in short-term borrowings	824	(3,015)
Proceeds from issuance of long-term debt	105	1,085
Principal payments or redemption of long-term debt	(370)	(2,679)
Proceeds from issuance of preferred stock		1,088
Proceeds from issuance of common stock	79	98
Repurchase of common stock	(500)	(438)
Cash dividends paid on preferred stock	(64)	(30)
Cash dividends paid on common stock	(367)	(239)
Net cash used in financing activities	(1,464)	(1,710)
Change in cash and due from banks	(1,320)	(4,401)
Cash and due from banks at beginning of period	8,252	13,962
Cash and due from banks at end of period	$ 6,932	$ 9,561