Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net (loss) income	$ (148)	$ 905
Adjustments to net (loss) income to derive net cash provided by operating activities:
Depreciation and amortization	844	523
Share-based compensation	207	99
Deferred income taxes	(400)	(43)
Change in operating assets and liabilities	702	(474)
Pension obligation	(72)	55
Excess tax benefits from payments under share-based compensation plans	56	48
Other, net	(172)	(74)
Net Cash Provided by Operating Activities	1,017	1,040
Investing Activities
Capital expenditures	(391)	(272)
Proceeds from sale of investments, net	7	26
Acquisitions of businesses, net of cash acquired	(15,118)	(40)
Proceeds from divestitures, net	100	165
Other, net	(138)	(34)
Net Cash (Used for) Provided by Investing Activities	(15,540)	(155)
Financing Activities
Change in credit facility borrowings	380	(50)
Proceeds from long-term debt	3,622	1,054
Payments of debt	(1,833)	(2,189)
Repurchase of common stock	0	(220)
Dividends paid	(449)	(312)
Other, net	(155)	(144)
Net Cash Provided by (Used for) Financing Activities	1,565	(1,861)
Effect of exchange rate changes on cash and equivalents	29	(17)
Net decrease in cash and equivalents	(12,929)	(993)
Opening Cash and Equivalents	14,179	1,541
Closing Cash and Equivalents	1,251	548
Noncash Investing and Financing Items [Abstract]
Fair value of the Company’s issued shares	8,004	0
Non-cash consideration-fair value of equity awards issued	$ 613	$ 0