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Debt Line of Credit and Commercial Paper (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |
Unamortized Discount | $ 66,752 |
A 250 billion LOC [Member] [Domain] |  |
Line of Credit Facility [Line Items] |  |
Unsecured revolving credit facility | $ 2,500,000 | $ 2,500,000
Debt Instrument, Maturity Date | Apr. 02, 2018 |
ability to increase LOC facility | $ 500,000 |
Debt Instrument, Basis Spread on Variable Rate | 0.95% |
Line Of Credit Facility Commitment Fee | 15 |
Write off of Deferred Debt Issuance Cost | $ 400 |
Remaining borrowing capacity |  | 2,070,000
Amount restricted/dedicated to support letters of credit |  | $ 45,100
Weighted average interest rate on revolving letter of credit |  | 1.07%
200 billion LOC [Domain] |  |
Line of Credit Facility [Line Items] |  |
Unsecured revolving credit facility | $ 2,000,000 |
Debt Instrument, Maturity Date | Jan. 10, 2022 |
ability to increase LOC facility | $ 750,000 |
Debt Instrument, Basis Spread on Variable Rate |  | 0.00%
Line Of Credit Facility Commitment Fee | 12.5 |
Remaining borrowing capacity | $ 1,960,000 |
Amount restricted/dedicated to support letters of credit | 20,600 |
Weighted average interest rate on revolving letter of credit |  | 1.37%
Commercial Paper [Member] |  |
Line of Credit Facility [Line Items] |  |
Commercial paper, maximum borrowing capacity | 500,000 |
Commercial Paper, net | 20,000 | $ 387,300
commercial paper principal outstanding | $ 20,000 | 387,500
Unamortized Discount |  | $ 200
Weighted Average Interest Rate Commercial Paper | 0.90% | 0.56%
Commercial Paper Weighted average days outstanding | 4 days | 19 days
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | A 250 billion LOC [Member] [Domain] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 0.95% |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | 200 billion LOC [Domain] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 0.825% |

X
- 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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- Definition Commercial Paper Weighted average days outstanding + References No definition available. + Details
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- 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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- Definition Represents the gross amount of commercial paper outstanding, not adjusted for the discount. + References No definition available. + Details
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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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- Definition The weighted average interest rate on commercial paper during the period. + References No definition available. + Details
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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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- 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 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)(a)(3)) -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 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -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 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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- Definition Amount of increase (decrease), classified as other, of the credit facility. + 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 + 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 + 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 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References 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 + Details
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