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Basis of Presentation and Significant Accounting Policies Revenue from Non-Insurance Contracts (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Disaggregation of Revenue [Table Text Block] | Revenue from Non-Insurance Contracts with Customers
|  | Year ended December 31,
| Revenue Line Item | 2018 | 2017 | 2016
Commercial Lines |  |  |  |
Installment billing fees | Fee income | $ | 34 |  | $ | 37 |  | $ | 39 |
Personal Lines |  |  |  |
Installment billing fees | Fee income | 40 |  | 44 |  | 39 |
Insurance servicing revenues | Other revenues | 84 |  | 85 |  | 86 |
Group Benefits |  |  |  |
Administrative services | Fee income | 175 |  | 91 |  | 75 |
Hartford Funds |  |  |  |
Advisor, distribution and other management fees | Fee income | 947 |  | 897 |  | 797 |
Other fees | Fee income | 85 |  | 95 |  | 88 |
Corporate |  |  |  |
Investment management and other fees | Fee income | 32 |  | 4 |  | 3 |
Transition service revenues | Other revenues | 21 |  | — |  | — |
Total revenues subject to updated guidance |  | $ | 1,418 |  | $ | 1,253 |  | $ | 1,127 |

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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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