Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities:
Consolidated net income	$ 2,276	$ 3,152
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	2,678	2,551
Deferred income taxes	(50)	2
Unrealized (gains) and losses	1,845	0
Other operating activities	265	(170)
Changes in certain assets and liabilities, net of effects of acquisitions:
Receivables, net	1,134	726
Inventories	547	66
Accounts payable	(1,770)	(155)
Accrued liabilities	(1,813)	(1,838)
Accrued income taxes	49	1,051
Net cash provided by operating activities	5,161	5,385
Cash flows from investing activities:
Payments for property and equipment	(1,818)	(1,990)
Proceeds from the disposal of property and equipment	198	196
Business acquisitions, net of cash acquired	0	(88)
Other investing activities	(62)	21
Net cash used in investing activities	(1,682)	(1,861)
Cash flows from financing activities:
Net change in short-term borrowings	2,501	1,482
Repayments of long-term debt	(2,521)	(1,513)
Dividends paid	(1,533)	(1,549)
Purchase of Company stock	(539)	(2,185)
Dividends paid to noncontrolling interest	(66)	(54)
Purchase of noncontrolling interest	0	(8)
Other financing activities	(328)	(145)
Net cash used in financing activities	(2,486)	(3,972)
Effect of exchange rates on cash and cash equivalents	143	139
Net increase (decrease) in cash, cash equivalents and restricted cash	1,136	(309)
Cash, cash equivalents and restricted cash, beginning of year	7,014	7,144
Cash, cash equivalents and restricted cash, end of period	$ 8,150	$ 6,835