Gross Fair Value of Derivative Positions (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Oct. 01, 2011
Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	$ 140		$ 237
Counterparty netting, asset	(98)		(111)
Other Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	405		475
Counterparty netting, asset	(24)		(56)
Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(147)		(152)
Counterparty netting, liability	98		111
Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(51)		(129)
Counterparty netting, liability	24		56
Derivatives designated as hedges | Foreign exchange | Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	95		133
Derivatives designated as hedges | Foreign exchange | Other Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	31		33
Derivatives designated as hedges | Foreign exchange | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(70)		(100)
Derivatives designated as hedges | Foreign exchange | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(29)		(90)
Derivatives designated as hedges | Interest rate | Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets			1
Derivatives designated as hedges | Interest rate | Other Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	204		213
Derivatives designated as hedges | Interest rate | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(5)
Derivatives designated as hedges | Other derivatives | Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	9
Derivatives designated as hedges | Other derivatives | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities			(1)
Derivatives not designated as hedges | Foreign exchange | Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	36		103
Derivatives not designated as hedges | Foreign exchange | Other Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	170		229
Derivatives not designated as hedges | Foreign exchange | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(77)		(51)
Derivatives not designated as hedges | Foreign exchange | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(1)		(21)
Derivatives not designated as hedges | Interest rate | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	(16)		(18)
Derivative Financial Instruments, Assets | Current Assets
Derivatives, Fair Value [Line Items]
Total Derivatives	42	[1]	126	[1]
Derivative Financial Instruments, Assets | Other Assets
Derivatives, Fair Value [Line Items]
Total Derivatives	381	[1]	419	[1]
Derivative Financial Instruments, Liabilities | Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Total Derivatives	(49)	[1]	(41)	[1]
Derivative Financial Instruments, Liabilities | Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Total Derivatives	$ (27)	[1]	$ (73)	[1]

[1] Refer to Note 12 for further information on derivative fair values and counterparty netting.