Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities:
Consolidated net income	$ 3,152	$ 3,216
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	2,551	2,388
Deferred income taxes	2	(122)
Other operating activities	(170)	(33)
Changes in certain assets and liabilities, net of effects of acquisitions:
Receivables, net	726	494
Inventories	66	264
Accounts payable	(155)	(234)
Accrued liabilities	(1,838)	(590)
Accrued income taxes	1,051	810
Net cash provided by operating activities	5,385	6,193
Cash flows from investing activities:
Payments for property and equipment	(1,990)	(2,209)
Proceeds from the disposal of property and equipment	196	89
Business acquisitions, net of cash acquired	(88)	0
Other investing activities	8	1
Net cash used in investing activities	(1,874)	(2,119)
Cash flows from financing activities:
Net change in short-term borrowings	1,482	1,065
Proceeds from issuance of long-term debt	0	127
Payments of long-term debt	(1,513)	(2,013)
Dividends paid	(1,549)	(1,573)
Purchase of Company stock	(2,185)	(2,735)
Dividends paid to noncontrolling interest	(54)	(57)
Purchase of noncontrolling interest	(8)	(126)
Other financing activities	(145)	(120)
Net cash used in financing activities	(3,972)	(5,432)
Effect of exchange rates on cash and cash equivalents	139	250
Net increase (decrease) in cash and cash equivalents	(322)	(1,108)
Cash and cash equivalents at beginning of year	6,867	8,705
Cash and cash equivalents at end of period	$ 6,545	$ 7,597