Fair Value Measurements (Details) (Fair value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Jul. 06, 2014	Sep. 29, 2013
Level 1 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Total	$ 40	$ 73
Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Total	738	1,156
Total [Member]
Assets, Fair Value Disclosure [Abstract]
Total	778	1,229
Money Market Funds [Member] | Level 1 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	28	73
Money Market Funds [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	28	73
US Treasury Bill Securities [Member] | Level 1 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	12
US Treasury Bill Securities [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	12
Commercial Paper [Member] | Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	40	104
Marketable Securities - Available-for-sale	5
Commercial Paper [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents	40	104
Marketable Securities - Available-for-sale	5
Asset-backed Securities [Member] | Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	5
Asset-backed Securities [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	5
Corporate Debt Securities [Member] | Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	66	5
Corporate Debt Securities [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	66	5
Municipal Notes Bonds [Member] | Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents		17
Marketable Securities - Available-for-sale	608	1,010
Municipal Notes Bonds [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Cash Equivalents		17
Marketable Securities - Available-for-sale	608	1,010
Variable Rate Demand Obligation [Member] | Level 2 Inputs [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	14	20
Variable Rate Demand Obligation [Member] | Total [Member]
Assets, Fair Value Disclosure [Abstract]
Marketable Securities - Available-for-sale	$ 14	$ 20