Equity and Noncontrolling Interests - Changes in Accumulated Other Comprehensive Income, Net of Tax (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013		Mar. 31, 2012
Foreign Currency Translation Adjustments
Equity [Line Items]
Aggregate adjustment for the period, tax	$ 12		$ (12)		$ 21		$ 10
Realized and Unrealized Gains (Losses) on Derivatives
Equity [Line Items]
Current period changes in fair value, derivatives, tax	3		(10)		1		(9)
Reclassification to income, derivatives, tax	(2)	[1]	2	[1]	(4)	[1]	10	[1]
Unrealized Gains on Marketable Common Stock
Equity [Line Items]
Current period changes in fair value, marketable common stock, tax	0		0		0		0
Reclassification to income, marketable common stock, tax	0	[2]	0	[2]	0	[2]	0	[2]
Pension And Postretirement Plans
Equity [Line Items]
Reclassification to income, pension and postretirement, tax	2	[3]	2	[3]	6	[3]	3	[3]
Other changes, pension and postretirement, tax					$ 0	[3]	$ 0	[3]

[1] Refer to Note 14, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items on the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives

[2] Refer to Note 15, "Fair Value Measurements," of the notes to consolidated financial statements for disclosure of the line item on the consolidated statements of income affected by reclassifications from AOCI into income related to marketable common stock.

[3] Refer to Note 10, "Pension and Postretirement Plans," of the notes to consolidated financial statements for disclosure of the components of the Company's net periodic benefits costs associated with its defined benefit pension and postretirement plans. For the six months ended March 31, 2013, the amount reclassified from AOCI into income for pension and postretirement plans was split approximately evenly between cost of sales and selling, general and administrative expenses on the consolidated statement of income. For the other periods presented, the amounts reclassified from AOCI into income were primarily recorded in cost of sales.