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Debt Line of Credit and Commercial Paper (Details) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Line of Credit Facility [Line Items] |
Debt Instrument, Maturity Date | May 01, 2061
Debt Instrument, Basis Spread on Variable Rate | 0.95%
Commercial paper, maximum borrowing capacity | $ 500.0
A 175 billion LOC [Member] |
Line of Credit Facility [Line Items] |
Unsecured revolving credit facility | 1,750.0
A 250 billion LOC [Member] |
Line of Credit Facility [Line Items] |
Unsecured revolving credit facility | $ 2,500.0
Debt Instrument, Maturity Date | Apr. 01, 2018
500.0 million ability to increase | $ 500.0
Line Of Credit Facility Commitment Fee | 15 Basis Points
Remaining borrowing capacity | $ 2,460.0
Amount restricted/dedicated to support letters of credit | $ 41.7
Weighted Average Interest Rate Revolving Credit Facility | 1.06%
Commercial Paper [Member] |
Line of Credit Facility [Line Items] |
Weighted Average Interest Rate | 0.57%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 0.95%

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- Definition Represents the amount by which available borrowings on the unsecured revolving credit facility may be increased. The available borrowings may be increased by adding additional banks to the facility or obtaining the agreement of existing banks to increase their commitments. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the commercial paper program without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the program. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate on unsecured debt during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The weighted average interest rate on the revolving line of credit during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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Balance Type: | na
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- Definition Net increase or decrease in the carrying amount of the credit facility for the period for reasons other than accrued, but unpaid interest, additional borrowings, repayments, and forgiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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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. + References No definition available. + Details
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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. + References 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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