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Basis of Presentation and Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Revenue from non-insurance contracts with customers | Revenue from Non-Insurance Contracts with Customers
|  | Three months ended September 30, | Nine months ended September 30,
| Revenue Line Item | 2018 | 2017 | 2018 | 2017
Commercial Lines |  |  |  |  |
Installment billing fees | Fee income | $ | 9 |  | $ | 9 |  | $ | 26 |  | $ | 28 |
Personal Lines |  |  |  |  |
Installment billing fees | Fee income | 10 |  | 11 |  | 30 |  | 33 |
Insurance servicing revenues | Other revenues | 24 |  | 24 |  | 66 |  | 66 |
Group Benefits |  |  |  |  |
Administrative services | Fee income | 43 |  | 19 |  | 131 |  | 57 |
Mutual Funds |  |  |  |  |
Advisor, distribution and other management fees | Fee income | 245 |  | 229 |  | 722 |  | 660 |
Other fees | Fee income | 21 |  | 22 |  | 63 |  | 75 |
Corporate |  |  |  |  |
Investment management and other fees | Fee income | 15 |  | 1 |  | 21 |  | 2 |
Transition service revenues | Other revenues | 6 |  | — |  | 8 |  | — |
Total revenues subject to updated guidance |  | $ | 373 |  | $ | 315 |  | $ | 1,067 |  | $ | 921 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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