Assets and Liabilities Measured at Fair Value (Details) (USD $) In Millions, unless otherwise specified	Jun. 28, 2014	Sep. 28, 2013
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	$ 108	$ 305
Other Liabilities, Fair Value Disclosure	(198)
Total	(51)	447
Fair Value, Measurements, Recurring | Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	144	170
Derivatives liabilities	(75)	(94)
Fair Value, Measurements, Recurring | Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	218	267
Derivatives liabilities	(248)	(201)
Fair Value, Measurements, Recurring | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	108	305
Other Liabilities, Fair Value Disclosure	0
Total	108	305
Fair Value, Measurements, Recurring | Level 1 | Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	0
Other Liabilities, Fair Value Disclosure	0
Total	39	142
Fair Value, Measurements, Recurring | Level 2 | Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	144	170
Derivatives liabilities	(75)	(94)
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	218	267
Derivatives liabilities	(248)	(201)
Fair Value, Measurements, Recurring | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	0	0
Other Liabilities, Fair Value Disclosure	(198)
Total	(198)	0
Fair Value, Measurements, Recurring | Level 3 | Interest rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives assets	0	0
Derivatives liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings disclosed at fair value	16,586	14,544
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings disclosed at fair value	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings disclosed at fair value	15,620	13,630
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings disclosed at fair value	$ 966	$ 914