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Debt - Junior Subordinated Debt (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 | Dec. 31, 2017
7.875% Notes, due 2042 |  |
Debt Instrument [Line Items] |  |
Face Value |  | $ 600,000,000
Interest rate |  | 7.875%
Interest Rate Subsequent to Call Date |  | 5.596%
8.125% Notes, due 2068 |  |
Debt Instrument [Line Items] |  |
Face Value |  | $ 500,000,000
Interest rate |  | 8.125%
Interest Rate Subsequent to Call Date |  | 4.6025%
3 month Libor 2.125% Notes, due 2067 |  |
Debt Instrument [Line Items] |  |
Face Value |  | $ 500,000,000
Interest Rate Subsequent to Call Date |  | 2.125%
LIBOR | 3 month Libor 2.125% Notes, due 2067 |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 2.125% | 2.125%
Interest rate | 4.39% |

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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 Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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