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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt - Narrative (Details)		3 Months Ended	9 Months Ended
Debt - Narrative (Details)	Jan. 27, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jan. 28, 2015 USD ($)
Debt Instrument [Line Items]
Principal Amount		$ 16,000,000,000	$ 16,000,000,000
Net aggregate proceeds		15,879,000,000	$ 15,879,000,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Interest rate on senior notes, minimum			1.20%
Interest rate on senior notes, maximum			4.30%
Interest expense		$ 125,000,000	$ 274,000,000
Senior Notes \| Minimum
Debt Instrument [Line Items]
Debt maturity period			2 years
Senior Notes \| Maximum
Debt Instrument [Line Items]
Debt maturity period			30 years
Revolving Credit Facility \| Credit Facility Expiring January 27, 2021 [Member]
Debt Instrument [Line Items]
Debt maturity period	5 years
Line of credit facility, maximum borrowing capacity	$ 4,000,000,000.0
Consolidated Indebtedness to Consolidated EBITDA Ratio (not greater than)	3.75
Revolving Credit Facility \| Credit Facility Expiring January 27, 2016 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 3,000,000,000.0
If Redeemed Prior to Maturity Date or Par Call Date, as Applicable \| Senior Notes
Debt Instrument [Line Items]
Redemption price, as percentage of principal amount (percent)			100.00%
If Redeemed on or after Par Call Date, except for 2017 Notes \| Senior Notes
Debt Instrument [Line Items]
Redemption price, as percentage of principal amount (percent)			100.00%