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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	12 Months Ended
	Dec. 31, 2018 USD ($) T shares	Sep. 30, 2018 USD ($) T Swap shares	Dec. 31, 2018 EUR (€) T	Dec. 31, 2018 JPY (¥) T	Sep. 30, 2018 EUR (€) T Swap	Sep. 30, 2018 JPY (¥) T Swap
Derivative Instruments [Line Items]
Hedge Percentage For Foreign Exchange Transactional Exposures Minimum	70.00%
Hedge Percentage For Foreign Exchange Transactional Exposures Maximum	90.00%
Number of Interest Rate Derivatives Held | Swap		0			0	0
Derivative, amount of hedged ordinary shares | shares	1.6	1.8
Derivative assets	$ 64	$ 80
Derivative liabilities	$ 3,152	$ 3,175
Copper [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T	3,175	3,175	3,175	3,175	3,175	3,175
Polypropylene [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T	29,482	15,868	29,482	29,482	15,868	15,868
Lead [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T	29,016	49,066	29,016	29,016	49,066	49,066
Aluminum [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T	3,955	3,381	3,955	3,955	3,381	3,381
Tin [Member]
Derivative Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | T	3,588	3,076	3,588	3,588	3,076	3,076
Equity swap
Derivative Instruments [Line Items]
Derivative, Amount of Hedged Item	$ 66	$ 73
Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | ¥				¥ 35		¥ 35
Designated as Hedging Instrument
Derivative Instruments [Line Items]
Derivative assets	10	7
Derivative liabilities	3,143	3,173
Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative assets	9	6
Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative assets	0	1
Designated as Hedging Instrument | Assets Held for Sale, Current [Member] | 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	15	10
Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities	2	2
Designated as Hedging Instrument | Liabilities Held for Sale, Current [Member] | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities	11	12
Designated as Hedging Instrument | Long-term Debt | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Derivative liabilities	3,115	3,149
Not Designated as Hedging Instrument
Derivative Instruments [Line Items]
Derivative assets	54	73
Derivative liabilities	9	2
Not Designated as Hedging Instrument | Other Current Assets | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative assets	7	10
Not Designated as Hedging Instrument | Other Current Assets | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative assets	0	0
Not Designated as Hedging Instrument | Assets Held for Sale, Current [Member] | 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	47	63
Not Designated as Hedging Instrument | Other Current Liabilities | Foreign Currency Exchange Derivatives
Derivative Instruments [Line Items]
Derivative liabilities	9	2
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity Derivatives
Derivative Instruments [Line Items]
Derivative liabilities	0	0
Not Designated as Hedging Instrument | Liabilities Held for Sale, Current [Member] | 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 | €			€ 1,000		€ 1,000
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | €			423		423
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Notional amount | €			€ 58		€ 58

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Derivative Instruments [Line Items]

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Number of interest rate derivative instruments held by the entity at the reporting date.

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