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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Detail) € in Millions, shares in Millions, $ in Millions, ¥ in Billions	3 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2019 USD ($) T Swap shares	Sep. 30, 2019 USD ($) T shares
Derivative Instruments [Line Items]
Hedge Percentage For Foreign Exchange Transactional Exposures Minimum	70.00%	70.00%
Hedge Percentage For Foreign Exchange Transactional Exposures Maximum	90.00%	90.00%
Number of Interest Rate Derivatives Held | Swap
Derivative, amount of hedged ordinary shares | shares			1.4	1.4
Derivative assets			$ 106	$ 97
Derivative liabilities			$ 2,611	$ 2,568
Copper [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T			3,447	3,561
Aluminum [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T			2,691	2,967
Equity swap
Derivative Instruments [Line Items]
Derivative, Amount of Hedged Item			$ 60	$ 60
Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | ¥		¥ 25
Other Current Liabilities | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities				1
Designated as Hedging Instrument
Derivative Instruments [Line Items]
Derivative assets			11	16
Derivative liabilities			2,610	2,568
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative assets			10	16
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative assets			1	0
Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap
Derivative Instruments [Line Items]
Derivative assets			0	0
Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative liabilities			8	23
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities			0	1
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Derivative liabilities			2,602	2,544
Not Designated as Hedging Instrument
Derivative Instruments [Line Items]
Derivative assets			95	81
Derivative liabilities			1	0
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative assets			37	19
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative assets			0	0
Not Designated as Hedging Instrument | Other Noncurrent Assets | Equity swap
Derivative Instruments [Line Items]
Derivative assets			58	62
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative liabilities			1	0
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities			0	0
Not Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Derivative liabilities			$ 0	$ 0
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | €	€ 888
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | €	423
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | €	€ 54

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