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Basis of Presentation and Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Revenue from non-insurance contracts with customers | Revenue from Non-Insurance Contracts with Customers
|  | Three months ended June 30, | Six months ended June 30,
| Revenue Line Item | 2018 | 2017 | 2018 | 2017
Commercial Lines |  |  |  |  |
Installment billing fees | Fee income | $ | 8 |  | $ | 9 |  | $ | 17 |  | $ | 19 |
Personal Lines |  |  |  |  |
Installment billing fees | Fee income | 10 |  | 11 |  | 20 |  | 22 |
Insurance servicing revenues | Other revenues | 23 |  | 23 |  | 42 |  | 42 |
Group Benefits |  |  |  |  |
Administrative services | Fee income | 44 |  | 19 |  | 88 |  | 38 |
Mutual Funds |  |  |  |  |
Advisor, distribution and other management fees | Fee income | 239 |  | 220 |  | 477 |  | 431 |
Other fees | Fee income | 22 |  | 27 |  | 42 |  | 53 |
Corporate |  |  |  |  |
Investment management and other fees | Fee income | 4 |  | — |  | 6 |  | 1 |
Transition service revenues | Other revenues | 2 |  | — |  | 2 |  | — |
Total revenues subject to updated guidance |  | $ | 352 |  | $ | 309 |  | $ | 694 |  | $ | 606 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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