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Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Financial Instruments (Details) - USD ($) $ in Millions	Mar. 25, 2016	Mar. 27, 2015	Mar. 25, 2016	Mar. 27, 2015	Sep. 25, 2015
Available-for-sale investments
Available-for-sale Securities, Gross Unrealized Gain (Loss)	$ 3	$ 0	$ 5	$ 0
Trading Securities, Change in Unrealized Holding Gain (Loss)	1	(1)	(2)	$ (4)
Recurring
Available-for-sale investments
Cash equivalents	20		20		$ 909
Investments, Fair Value Disclosure	341		341		1,231
Level 1 \| Recurring
Available-for-sale investments
Cash equivalents	20		20		909
Investments, Fair Value Disclosure	341		341		1,231
Level 2 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	0		0		0
Debt Securities
Available-for-sale investments
Trading Securities, Change in Unrealized Holding Gain (Loss)		$ 3
Debt Securities \| Available-for-sale Securities \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	185		185		186
Debt Securities \| Available-for-sale Securities \| Level 1 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	185		185		186
Debt Securities \| Available-for-sale Securities \| Level 2 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	0		0
Equity Securities \| Level 2 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	0		0
Equity Securities \| Available-for-sale Securities \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	80		80		77
Equity Securities \| Available-for-sale Securities \| Level 1 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	80		80		77
Equity Securities \| Available-for-sale Securities \| Level 2 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	0		0		0
Equity Securities \| Trading Securities \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	56		56		59
Equity Securities \| Trading Securities \| Level 1 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure	56		56		59
Equity Securities \| Trading Securities \| Level 2 \| Recurring
Available-for-sale investments
Investments, Fair Value Disclosure					0
Foreign Exchange Contract
Available-for-sale investments
Derivative, notional amount	570		570		365
Cash and Cash Equivalents
Available-for-sale investments
Cash equivalents	20		20		909
Investments, Fair Value Disclosure	20		20		909
Prepaid Expenses and Other Current Assets
Available-for-sale investments
Investments, Fair Value Disclosure	85		85		74
Prepaid Expenses and Other Current Assets \| Debt Securities \| Available-for-sale Securities
Available-for-sale investments
Investments, Fair Value Disclosure	29		29		15
Prepaid Expenses and Other Current Assets \| Equity Securities \| Available-for-sale Securities
Available-for-sale investments
Investments, Fair Value Disclosure	0		0		0
Prepaid Expenses and Other Current Assets \| Equity Securities \| Trading Securities
Available-for-sale investments
Investments, Fair Value Disclosure	56		56		59
Other Assets
Available-for-sale investments
Investments, Fair Value Disclosure	236		236		248
Other Assets \| Debt Securities \| Available-for-sale Securities
Available-for-sale investments
Investments, Fair Value Disclosure	156		156		171
Other Assets \| Equity Securities \| Available-for-sale Securities
Available-for-sale investments
Investments, Fair Value Disclosure	80		80		77
Other Assets \| Equity Securities \| Trading Securities
Available-for-sale investments
Investments, Fair Value Disclosure	0		0		0
Affiliated Entity
Available-for-sale investments
Intercompany Loans Designated as Permanent	1,300		1,300		$ 1,400
1.375% public notes due 2025
Available-for-sale investments
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 13		$ 0