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Debt (Junior subordinated notes) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Debt |  | $ 28,420,739,000 | $ 27,716,999,000
Revolving Credit Facility Before Issuance Of Junior Subondinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity | $ 1,000,000,000.0 |  |
Revolving Credit Facility After Issuance Of Junior Subondinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility maximum borrowing capacity | $ 500,000,000.0 |  |
Deferral of interest payments, maximum term | 5 years |  |
Subordinated Debt [Member] | Junior Subordinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt | $ 500,000,000 |  |
Debt, fixed interest rate | 6.50% |  |
Spread over reference rate | 4.30% |  |
Subordinated Debt [Member] | Junior Subordinated Notes [Member] | Debt Instrument, Redemption, Option (i) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price of debt instrument, percentage |  | 100.00% |
Subordinated Debt [Member] | Junior Subordinated Notes [Member] | Debt Instrument, Redemption, Option (iii) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price of debt instrument, percentage |  | 100.00% |
Subordinated Debt [Member] | Junior Subordinated Notes [Member] | Debt Instrument, Redemption, Option (iv) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price of debt instrument, percentage |  | 101.00% |
Days after occurence |  | 60 days |
Annual interest rate increase |  | 5.00% |

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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