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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying value of goodwill by reporting segment | Changes in the carrying value of goodwill during 2015, 2016 and 2017, by reporting segment, are presented in the following table (in millions):
| Property and Casualty |  | Annuity |  | Total
Balance at January 1, 2015 | $ | 168 |  |  | $ | 33 |  |  | $ | 201 |
Sale of subsidiaries in 2015 | — |  |  | (2 | ) |  | (2 | )
Balance at December 31, 2015, December 31, 2016 and December 31, 2017 | $ | 168 |  |  | $ | 31 |  |  | $ | 199 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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