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Schedule I - Condensed Financial Information of Parent (Guarantees and Letters of Credit) (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) agreement
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 43
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 789,000,000
Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Letter of credit, fee range minimum | 0.20%
Letter of credit, fee range maximum | 2.50%
Guarantees | Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Obligations, Minimum Individual Exposures | $ 8,000,000
Obligations, individual exposures (minimum less than $1 million) | $ 58,000,000
Guarantees and Asset Sale Related Indemnities (Combined) [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 19
Guarantees and Asset Sale Related Indemnities (Combined) [Member] | Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Obligations maximum exposure, total | $ 535,000,000
Letter of Credit | Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Obligations, individual exposures (minimum less than $1 million) | 1,000,000
Cash Collateralized Letters Of Credit | Parent Company |
Condensed Financial Statements, Captions [Line Items] |
Obligations maximum exposure, total | 3,000,000
Obligations, Minimum Individual Exposures | 2,000,000
Obligations, individual exposures (minimum less than $1 million) | 3,000,000
Cash Collateralized Letters Of Credit | Parent Company | Maximum |
Condensed Financial Statements, Captions [Line Items] |
Obligations, individual exposures (minimum less than $1 million) | $ 73,000,000
Standby Letters of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 15
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 6,000,000
Financial Standby Letter of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 1
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 3,000,000
Unsecured Debt [Member] | Financial Standby Letter of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Obligations number of agreements | agreement | 8
Secured Debt [Member] | Financial Standby Letter of Credit [Member] |
Condensed Financial Statements, Captions [Line Items] |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 245,000,000

X
- Definition The maximum of the per annum range of letter of credit fees as a percent of the outstanding amount. + References No definition available. + Details
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X
- Definition The minimum of the per annum range of letter of credit fees as a percent of the outstanding amount. + References No definition available. + Details
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X
- Definition Total maximum potential amount of future payments (undiscounted) the Parent Company could be required to make under the obligation or each group of similar obligations before reduction for potential recoveries under recourse or collateralization provisions. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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