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Debt - Junior Subordinated Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Junior Subordinated Notes Seven Point Eight Seven Five Percent Due Two Thousand Forty Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face Value |  | $ 600 |
Interest rate |  | 7.875% | 7.875%
3 month Libor 2.125% Notes, due 2067 [1] |  |  |
Debt Instrument [Line Items] |  |  |
Face Value |  | $ 500 |
3 month Libor 2.125% Notes, due 2067 [1] | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate | 2.125% | 2.125% |
Derivative, Fixed Interest Rate | 4.39% |  |
LIBOR Plus Five Point Five Nine Six Percent Junior Subordinated Notes Due Two Thousand Twenty Two [Member] [Domain] | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate |  | 5.596% |

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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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -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 + Details
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