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Debt (ECAPS subordinated notes) (Details) - Subordinated	1 Months Ended
	Dec. 31, 2005 USD ($)
ECAPS Subordinated Notes
Debt Instrument [Line Items]
Face amount	$ 1,000,000,000.0
ECAPS Subordinated Debt $400 Million Tranche
Debt Instrument [Line Items]
Face amount	$ 400,000,000.0
Spread over reference rate	1.80%
ECAPS Subordinated Debt $600 Million Tranche
Debt Instrument [Line Items]
Face amount	$ 600,000,000.0
Spread over reference rate	1.55%

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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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.

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