Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Cash flows from operating activities:
Consolidated net income	$ 3,726	$ 3,945
Income from discontinued operations, net of income taxes	(15)	(13)
Income from continuing operations	3,711	3,932
Adjustments to reconcile consoliated net income to net cash provided by operating activities:
Depreciation and amortization	2,250	2,187
Deferred income taxes	26	128
Other operating activities	543	(350)
Changes in certain assets and liabilities:
Receivables, net	613	567
Inventories	(423)	584
Accounts payable	(831)	(743)
Accrued liabilities	(942)	(1,527)
Accrued income taxes	992	116
Net cash provided by operating activities	5,939	4,894
Cash flows from investing activities:
Payments for property and equipment	(2,157)	(2,968)
Proceeds from the disposal of property and equipment	48	35
Other investing activities	(12)	(49)
Net cash used in investing activities	(2,121)	(2,982)
Cash flows from financing activities:
Net change in short-term borrowings	(4,129)	(551)
Proceeds from issuance of long-term debt	4,519	4,977
Payments of long-term debt	(1,574)	(1,088)
Dividends paid	(1,547)	(1,549)
Purchase of Company stock	(626)	(2,246)
Dividends paid to noncontrolling interest	(28)	0
Purchase of noncontrolling interest	(1,626)	(81)
Other financing activities	(166)	(217)
Net cash used in financing activities	(5,177)	(755)
Effect of exchange rates on cash and cash equivalents	90	(83)
Net increase (decrease) in cash and cash equivalents	(1,269)	1,074
Cash and cash equivalents at beginning of year	7,281	7,781
Cash and cash equivalents at end of period	$ 6,012	$ 8,855