| **Short Term Debt Instruments (Details)**                                   | 3 Months Ended | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |               |
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| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Credit Facility Current Borrowing Capacity                                  | $ 850,000,000  | $ 850,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Maximum Facility                                                            | 850,000,000    | 850,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |          |
| Commercial Paper                                                            | 370,000,000    | 370,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 355,000,000 |
| Revolving Credit Facility                                                   |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Credit Facility Current Borrowing Capacity                                  | $ 850,000,000  | $ 850,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Line of Credit Facility, Expiration Date                                    |           | Oct.  01,  2017                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |          |
| Line Of Credit Facility Frequency Of Commitment Fee Payment                 |           | annual                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |          |
| Line of Credit Facility, Commitment Fee Description                         |           | $35,000 plus 8.5 basis points                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Credit Facility Interest Rate Description                                   |           | 30-day London Interbank Offered Rate (LIBOR) plus from 75 to 125 basis points                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         |           | 0.085%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |          |
| Line of Credit Facility, Commitment Fee Amount                              |           | $ 35,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |          |
| Minimum amount outstanding during period                                    |           | 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |          |
| Maximum amount outstanding during period                                    |           | $ 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |          |
| Credit Facility Covenant Terms                                              |           | total debt to total capitalization of no greater than 70%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |          |
| Credit Facility Covenant Compliance                                         |           | actual ratio was 56%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Covenant Total Debt To Total Capital Ratio                             |           | 70.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |          |
| Ratio of Indebtedness to Net Capital                                        | 0.56           | 0.56                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Instrument, Basis Spread on Variable Rate                              |           | 0.75%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |
| Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Instrument, Basis Spread on Variable Rate                              |           | 1.25%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |
| Letter Of Credit                                                            |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Credit Facility Current Borrowing Capacity                                  | $ 10,000,000   | $ 10,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 10,000,000    |
| Letters of Credit Outstanding, Amount                                       | $ 1,700,000    | $ 1,700,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 1,800,000   |
| Commercial Paper                                                            |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Credit Facility Interest Rate Description                                   |           | interest based on, among other things, the size and maturity date of the note, the frequency of the issuance and our credit ratings, plus a spread of 5 basis points                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Short Term Borrowings Term                                                  |           | $850 million unsecured CP program that is backstopped by the revolving syndicated credit facility. The amounts outstanding under the revolving syndicated credit facility and the CP program, either individually or in the aggregate, cannot exceed $850 million. The notes issued under the CP program may have maturities not to exceed 397 days from the date of issuance and bear interest based on, among other things, the size and maturity date of the note, the frequency of the issuance and our credit ratings, plus a spread of 5 basis points. Any borrowings under the CP program rank equally with our other unsecured debt. |          |
| Maximum Number Of Possible Days Outstanding For Commercial Paper Program    |           | 397 days                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |          |
| Weighted Average Interest Rate                                              | 0.19%          | 0.19%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 0.17%         |
| Minimum amount outstanding during period                                    | $ 250,000,000  | $ 230,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Maximum amount outstanding during period                                    | $ 370,000,000  | $ 580,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |          |
| Commercial Paper | Base Rate                                                |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Instrument, Basis Spread on Variable Rate                              |           | 0.05%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |
| Commercial Paper | Minimum                                                  |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Instrument, Term                                                       | 7 days         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Line of Credit Facility Interest Rate During Period                         | 0.16%          | 0.15%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |
| Commercial Paper | Maximum                                                  |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Debt Instrument, Term                                                       | 14 days        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Line of Credit Facility Interest Rate During Period                         | 0.21%          | 0.30%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |
| Commercial Paper | Weighted Average                                         |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| **Line Of Credit Facility [Line Items]**                                    |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |          |
| Line of Credit Facility Interest Rate During Period                         | 0.20%          | 0.21%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |          |

| X                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt Covenant, Total Debt To Total Capital Ratio
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| - Definition
Minimum amount borrowed under the credit facility at any time during the period
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| - Definition
The maximum number of possible days outstanding from the initial issuance date of the note until maturity for the debt outstanding under the commercial paper program as of the end of the period.
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No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.
+ References
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| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
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No definition available.
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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.
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| - Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.
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No definition available.
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| - Definition
Amount of the fee for available but unused credit capacity under the credit facility.
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| - Definition
Description of the fees for amounts available, but unused under the credit facility.
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| - Definition
Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.
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| - Definition
Description of the conditions for borrowing under the credit facility including the nature of any restrictions.
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| - Definition
Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.
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| - Definition
Date the credit facility terminates, in CCYY-MM-DD format.
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| - Definition
Description of when the fee for available but unused credit capacity is required to be paid (for example, annually, quarterly, or monthly).
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| - Definition
Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).
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| - Definition
The effective interest rate during the reporting period.
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| - Definition
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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| - Definition
Maximum amount borrowed under the credit facility at any time during the period.
+ References
No definition available.
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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
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.
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No definition available.
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| - Definition
Indebtedness divided by net capital.
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Information about borrowings which initially required repayment in less than twelve months (or normal operating cycle, if longer) after its issuance and that does not otherwise qualify as long-term debt. It typically is comprised of borrowings under letters of credit, lines of credit, commercial paper, and notes payable of short duration. Disclosures include amounts of borrowings under each arrangement, description of underlying arrangements, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements such as the effects of refinancings and noncompliance with debt covenants.
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| - Definition
Weighted average interest rate of short-term debt outstanding.
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