Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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- Definition

Percentage of principal amount of debt redeemed.

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No definition available.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Commercial Paper, Amount Outstanding

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No definition available.

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Commercial Paper, Maximum Borrowing Capacity

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No definition available.

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- Definition

Debt Covenant, Consolidated Indebtedness to Consolidated EBITDA Ratio

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No definition available.

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Debt - Additional Information (Detail)		1 Months Ended	12 Months Ended
Debt - Additional Information (Detail)	Jan. 27, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 16,000,000,000	$ 16,000,000,000
Net aggregate proceeds			15,882,000,000	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Credit Facility Maximum Borrowing Capacity	$ 4,000,000,000			$ 3,000,000,000
Consolidated indebtedness to consolidated EBITDA ratio (not greater than)	3.75
Credit Facility Amount Outanding			0
Commercial Paper
Debt Instrument [Line Items]
Commercial Paper Program, Amount Available			$ 3,000,000,000
Commercial Paper Program, Maturity Period			P397D
Commercial Paper Program, Amount Outstanding			$ 0
Senior Notes
Debt Instrument [Line Items]
Principal amount			16,000,000,000
Interest expense			399,000,000
Net aggregate proceeds		$ 15,900,000,000	$ 15,882,000,000
Senior Notes \| Minimum
Debt Instrument [Line Items]
Maturity period for senior notes		2 years
Stated interest rate (percent)			1.20%
Senior Notes \| Maximum
Debt Instrument [Line Items]
Maturity period for senior notes		30 years
Stated interest rate (percent)			4.30%
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%