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Debt - Private Placement Facilities (Details) - Private placement facilities [Member] $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 10, 2010 USD ($) company | Sep. 24, 2016 USD ($) | Sep. 22, 2014 USD ($) | Apr. 30, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |
Date of borrowing | Aug. 10, 2010 |  |  |
Debt instrument, maximum borrowing capacity | $ 400 | $ 975 |  |
Private placement facility additional borrowing capacity |  |  | $ 200 | $ 375
Number of insurance companies providing private placement facilities (in number of insurance companies) | company | 2 |  |  |
Debt instrument, maturity date |  | Sep. 22, 2017 |  |
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term of issuances under private placement facilities |  | 5 years |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term of issuances under private placement facilities |  | 15 years |  |
Average term of issuances under private placement facilities |  | 12 years |  |

X
- Definition Average period of time between issuance and maturity of the debt instruments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The increase in the maximum borrowing capacity under the entity's private placement facilities. + References No definition available. + Details
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- Definition The maximum amount which can be borrowed under a debt instrument. + References No definition available. + Details
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X
- Definition The number of insurance companies that have provided the private placement facilities. + References No definition available. + Details
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X
- Definition Date the debt instrument was issued, 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- 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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X
- 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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X
- 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. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Period Type: |