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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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- 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 + Details
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- Definition 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 + Details
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