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Debt (ECAPS Subordinated Notes Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2005 USD ($) item | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |
Long-term Debt | $ 27,716,999,000 |  | $ 29,641,863,000
Notes payable | 27,716,999,000 |  | 29,641,863,000
Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 1,555,548,000 |  | 1,564,045,000
Notes payable | 1,555,548,000 |  | 1,564,045,000
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 Number of tranches in debt instrument. + References No definition available. + Details
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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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: 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 + Details
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