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Debt (ECAPS Subordinated Notes Narrative) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2005 USD ($) item	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Long-term Debt	$ 29,806,843,000		$ 30,402,392,000
Notes payable	29,806,843,000		30,402,392,000
Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	1,564,045,000		1,064,042,000
Notes payable	1,564,045,000		1,064,042,000
Subordinated Debt [Member] | ECAPs Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,000,000,000		1,000,000,000
Face amount		$ 1,000,000,000
Debt, maturity	2065
Number of tranches | item		2
Notes payable	$ 1,000,000,000		$ 1,000,000,000
Subordinated Debt [Member] | ECAPS Subordinated Debt $600 Million Tranche [Member]
Debt Instrument [Line Items]
Face amount	600,000,000
Subordinated Debt [Member] | ECAPS Subordinated Debt $400 Million Tranche [Member]
Debt Instrument [Line Items]
Face amount	$ 400,000,000
Debt, fixed interest rate	6.25%
Subordinated Debt [Member] | LIBOR [Member] | ECAPS Subordinated Debt $600 Million Tranche [Member]
Debt Instrument [Line Items]
Spread over reference rate	1.55%
Subordinated Debt [Member] | LIBOR [Member] | ECAPS Subordinated Debt $400 Million Tranche [Member]
Debt Instrument [Line Items]
Spread over reference rate	1.80%

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Debt instrument maturity period

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

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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=34725769&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=6451184&loc=d3e28551-108399

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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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.

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-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

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