Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Cash flows from operating activities:
Consolidated net income	$ 11,880	$ 10,980
Loss from discontinued operations, net of income taxes	0	36
Income from continuing operations	11,880	11,016
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	6,322	6,067
Deferred income taxes	279	1,342
Other operating activities	81	25
Changes in certain assets and liabilities, net of effects of acquisitions:
Accounts receivable	501	499
Inventories	(6,459)	(7,357)
Accounts payable	3,545	3,417
Accrued liabilities	(82)	(2,305)
Accrued income taxes	(160)	210
Net cash provided by operating activities	15,907	12,914
Cash flows from investing activities:
Payments for property and equipment	(8,921)	(9,543)
Proceeds from the disposal of property and equipment	343	354
Investments and business acquisitions, net of cash acquired	(716)	(3,537)
Other investing activities	(58)	(88)
Net cash used in investing activities	(9,352)	(12,814)
Cash flows from financing activities:
Net change in short-term borrowings	4,700	8,558
Proceeds from issuance of long-term debt	199	5,008
Payments of long-term debt	(639)	(4,265)
Dividends paid	(4,034)	(3,800)
Purchase of Company stock	(4,657)	(4,957)
Other financing activities	(263)	(828)
Net cash used in financing activities	(4,694)	(284)
Effect of exchange rates on cash and cash equivalents	232	(148)
Net increase (decrease) in cash and cash equivalents	2,093	(332)
Cash and cash equivalents at beginning of year	6,550	7,395
Cash and cash equivalents at end of period	$ 8,643	$ 7,063