Income Taxes, Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2017	Oct. 01, 2016
Gross Unrecognized Tax Benefits [Roll Forward]
Beginning unrecognized tax benefits	$ 62	$ 13
Gross increases - tax positions in prior periods	1	4
Gross increases - current period tax positions	4	1
Gross increases - from acquisitions	0	48
Gross decreases - tax positions in prior periods	(1)	0
Settlements	(3)	(1)
Lapse of statue of limitations	(4)	(3)
Ending unrecognized tax benefits	59	$ 62
Unrecognized tax benefits that would affect effective tax rate if recognized	55
Interest and penalties accrued for uncertain tax positions	$ 20

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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