Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Cash flows from operating activities:
Consolidated net income	$ 8,160	$ 8,055
Adjustments to reconcile consoliated net income to net cash provided by operating activities:
Depreciation and amortization	4,417	4,233
Deferred income taxes	475	(159)
Other operating activities	(204)	(404)
Changes in certain assets and liabilities:
Receivables, net	445	628
Inventories	569	237
Accounts payable	(324)	(685)
Accrued liabilities	(209)	(456)
Accrued income taxes	(2,078)	146
Net cash provided by operating activities	11,251	11,595
Cash flows from investing activities:
Payments for property and equipment	(6,066)	(5,522)
Proceeds from the disposal of property and equipment	112	158
Other investing activities	158	(334)
Net cash used in investing activities	(5,796)	(5,698)
Cash flows from financing activities:
Net change in short-term borrowings	1,869	2,061
Proceeds from issuance of long-term debt	5,326	150
Payments of long-term debt	(3,386)	(589)
Dividends paid	(3,092)	(2,698)
Purchase of Company stock	(4,096)	(3,429)
Other financing activities	(738)	(273)
Net cash used in financing activities	(4,117)	(4,778)
Effect of exchange rates on cash and cash equivalents	(103)	266
Net increase in cash and cash equivalents	1,235	1,385
Cash and cash equivalents at beginning of year	7,781	6,550
Cash and cash equivalents at end of period	$ 9,016	$ 7,935