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Debt (ECAPS subordinated notes) (Details) - Subordinated Debt [Member] - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2005
ECAPs Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Face amount |  | $ 1,000,000,000.0
ECAPS Subordinated Debt $400 Million Tranche [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 400,000,000.0 |
Debt, fixed interest rate | 6.25% |
ECAPS Subordinated Debt $600 Million Tranche [Member] |  |
Debt Instrument [Line Items] |  |
Face amount | $ 600,000,000.0 |
LIBOR [Member] | ECAPS Subordinated Debt $400 Million Tranche [Member] |  |
Debt Instrument [Line Items] |  |
Spread over reference rate | 1.80% |
LIBOR [Member] | ECAPS Subordinated Debt $600 Million Tranche [Member] |  |
Debt Instrument [Line Items] |  |
Spread over reference rate | 1.55% |

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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 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=64930785&loc=d3e28551-108399 + 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 The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 + Details
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- Details
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