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Subsequent Event - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 03, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |  |
Estimated pretax catastrophe losses, net of reinsurance and inclusive of reinstatement premiums and other associated offsets |  | $ 29 | $ 178 | $ 457 | $ 470
Estimated pretax catastrophe losses, net of reinsurance and inclusive of reinstatement premiums and other associated offsets (USD per share) |  | $ 0.13 | $ 1.23 | $ 3.44 | $ 2.98
Fire | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Estimated pretax catastrophe losses, net of reinsurance and inclusive of reinstatement premiums and other associated offsets (USD per share) | $ 0.18 |  |  |  |
Fire | Minimum | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Estimated pretax catastrophe losses, net of reinsurance and inclusive of reinstatement premiums and other associated offsets | $ 20 |  |  |  |
Fire | Maximum | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Estimated pretax catastrophe losses, net of reinsurance and inclusive of reinstatement premiums and other associated offsets | $ 25 |  |  |  |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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