Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Sep. 27, 2014	Sep. 28, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 100	$ 305
Other	(198)
Total recorded at fair value	444	447
Fair value of borrowings	15,275	14,544
Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	117	170
Derivatives liabilities	(75)	(94)
Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	621	267
Derivatives liabilities	(121)	(201)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	100	305
Total recorded at fair value	100	305
Fair value of borrowings	0	0
Level 1 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0
Level 1 | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Total recorded at fair value	542	142
Fair value of borrowings	14,374	13,630
Level 2 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	117	170
Derivatives liabilities	(75)	(94)
Level 2 | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	621	267
Derivatives liabilities	(121)	(201)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0	0
Other	(198)
Total recorded at fair value	(198)	0
Fair value of borrowings	901	914
Level 3 | Interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0
Level 3 | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives assets	0	0
Derivatives liabilities	$ 0	$ 0