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Debt And Other Credit Facilities (Consolidated amount of non-recourse project-finance debt of a VIE) (Details) £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2015 GBP (£) | Dec. 31, 2014
Long-term Debt, Maturing in Years Four and Five [Abstract] |  |  |
2016 | $ 10 |  |
2017 | 10 |  |
2018 | 10 |  |
2019 | 11 |  |
2020 | 12 |  |
Beyond 2019 | $ 8 |  |
Class A 3.5% Index Linked Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Guaranteed secured bonds, percentage |  |  | 3.50%
Class B 5.9% Fixed Rate Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Guaranteed secured bonds, percentage | 5.90% | 5.90% |
Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Subordinated notes payable, interest rate | 11.25% |  |
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Subordinated notes payable, interest rate | 16.00% |  |
United Kingdom, Pounds | Class A 3.5% Index Linked Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured bonds | £ |  | £ 56.0 |
United Kingdom, Pounds | Class B 5.9% Fixed Rate Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured bonds | £ |  | £ 16.7 |
United States of America, Dollars | Class A 3.5% Index Linked Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured bonds | $ 79 |  |
United States of America, Dollars | Class B 5.9% Fixed Rate Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured bonds | $ 24 |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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