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Commitments, Guarantees and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |
Consolidated Summary Financial Information | The following tables set forth certain consolidating summary financial information for SLF Inc. and Sun Life Assurance (consolidated):
Results for the years ended | SLF Inc. (unconsolidated) |  | Sun Life Assurance (consolidated) |  | Other subsidiaries of SLF Inc. (combined) |  | Consolidation adjustment |  | SLF Inc. (consolidated) |
December 31, 2018 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 361 |  |  | $ | 22,619 |  |  | $ | 4,453 |  |  | $ | (436 | ) |  | $ | 26,997 |
Shareholders' net income (loss) |  | $ | 2,616 |  |  | $ | 2,036 |  |  | $ | 382 |  |  | $ | (2,418 | ) |  | $ | 2,616 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 441 |  |  | $ | 23,421 |  |  | $ | 7,022 |  |  | $ | (1,550 | ) |  | $ | 29,334 |
Shareholders' net income (loss) |  | $ | 2,242 |  |  | $ | 1,577 |  |  | $ | 427 |  |  | $ | (2,004 | ) |  | $ | 2,242 |
Assets and liabilities as at | SLF Inc. (unconsolidated) |  | Sun Life Assurance (consolidated) |  | Other subsidiaries of SLF Inc. (combined) |  | Consolidation adjustment |  | SLF Inc. (consolidated) |
December 31, 2018 |  |  |  |  |  |  |  |  |  |
Invested assets |  | $ | 24,255 |  |  | $ | 143,040 |  |  | $ | 6,991 |  |  | $ | (22,560 | ) |  | $ | 151,726 |
Total other general fund assets |  | $ | 4,088 |  |  | $ | 21,958 |  |  | $ | 10,389 |  |  | $ | (19,396 | ) |  | $ | 17,039 |
Investments for account of segregated fund holders |  | $ | — |  |  | $ | 103,014 |  |  | $ | 48 |  |  | $ | — |  |  | $ | 103,062 |
Insurance contract liabilities |  | $ | — |  |  | $ | 122,066 |  |  | $ | 8,534 |  |  | $ | (8,677 | ) |  | $ | 121,923 |
Investment contract liabilities |  | $ | — |  |  | $ | 3,164 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,164 |
Total other general fund liabilities |  | $ | 4,636 |  |  | $ | 21,801 |  |  | $ | 5,972 |  |  | $ | (13,301 | ) |  | $ | 19,108 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |
Invested assets |  | $ | 23,382 |  |  | $ | 138,145 |  |  | $ | 6,531 |  |  | $ | (21,919 | ) |  | $ | 146,139 |
Total other general fund assets |  | $ | 7,530 |  |  | $ | 21,437 |  |  | $ | 17,152 |  |  | $ | (29,538 | ) |  | $ | 16,581 |
Investments for account of segregated fund holders |  | $ | — |  |  | $ | 106,341 |  |  | $ | 51 |  |  | $ | — |  |  | $ | 106,392 |
Insurance contract liabilities |  | $ | — |  |  | $ | 118,003 |  |  | $ | 8,234 |  |  | $ | (8,452 | ) |  | $ | 117,785 |
Investment contract liabilities |  | $ | — |  |  | $ | 3,082 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,082 |
Total other general fund liabilities |  | $ | 8,591 |  |  | $ | 21,558 |  |  | $ | 12,822 |  |  | $ | (24,089 | ) |  | $ | 18,882 |

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