Face (par) amount of debt instrument at time of issuance.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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-Subparagraph (bbb)(2)
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- Definition

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.

+ References

No definition available.

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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Balance Type:	credit
Period Type:	duration

- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Name Accounting Standards Codification
-Topic 944
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-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Balance Type:	debit
Period Type:	duration

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Debt (Narrative) (Details)	3 Months Ended				12 Months Ended
Debt (Narrative) (Details)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 JPY (¥)	Sep. 30, 2017 JPY (¥)
Fair value of long-term debt	$ 6,000,000,000		$ 5,100,000,000		$ 6,000,000,000	$ 5,100,000,000
Long-term debt	5,994,000,000		4,749,000,000		5,994,000,000	4,749,000,000
Proceeds from Issuance of Unsecured Debt	889,000,000	$ 596,000,000		$ 700,000,000	1,485,000,000	1,445,000,000
4.70% Note 19 Years Term [Member]
Debt Instrument, Face Amount	$ 50,000,000				$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.70%				4.70%
Debt Instrument, Term	19 years
5.35% Note 30 Years Term [Member]
Debt Instrument, Face Amount	$ 550,000,000				$ 550,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.35%				5.35%
Debt Instrument, Term	30 years
5.85% Note 50 Years Term [Member]
Debt Instrument, Face Amount	$ 300,000,000				$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.85%				5.85%
Debt Instrument, Term	50 years
0.698% Note 7 year term [Member]
Debt Instrument, Face Amount \| ¥									¥ 21,000,000,000
Debt Instrument, Interest Rate, Stated Percentage									0.698%
Debt Instrument, Term				7 years
0.992% Note 10 year term [Member]
Debt Instrument, Face Amount \| ¥									¥ 47,000,000,000
Debt Instrument, Interest Rate, Stated Percentage									0.992%
Debt Instrument, Term				10 years
1.583% Note 20 year term [Member]
Debt Instrument, Face Amount \| ¥									¥ 10,000,000,000
Debt Instrument, Interest Rate, Stated Percentage									1.583%
Debt Instrument, Term				20 years
0.722% Note 7 year term [Member]
Debt Instrument, Face Amount \| ¥								¥ 10,000,000,000
Debt Instrument, Interest Rate, Stated Percentage								0.722%
Debt Instrument, Term		7 years
1.043% Note 10 year term [Member]
Debt Instrument, Face Amount \| ¥								¥ 30,500,000,000
Debt Instrument, Interest Rate, Stated Percentage								1.043%
Debt Instrument, Term		10 years
1.219% Note 12 year term [Member]
Debt Instrument, Face Amount \| ¥								¥ 25,000,000,000
Debt Instrument, Interest Rate, Stated Percentage								1.219%
Debt Instrument, Term		12 years
Debentures, 4.375%, due 2057 [Member]
Debt Instrument, Face Amount			$ 750,000,000			$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.375%		4.375%		4.375%	4.375%
Debt Instrument, Maturity Date			Nov. 15, 2057
Proceeds from Issuance of Unsecured Debt			$ 743,000,000
6.625% Due 2019 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.625%				6.625%
Repayment of long-term debt	$ 250,000,000
Revolving Credit Facility [Member] \| Amended Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 1,500,000,000
Line of Credit Facility, Expiration Date					Aug. 15, 2023
Line of credit outstanding	0				$ 0
Commercial Paper [Member]
Line of credit outstanding	$ 0		$ 0		$ 0	$ 0