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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Valuation And Qualifying Accounts [Table Text Block] | REINSURANCE GROUP OF AMERICA, INCORPORATED SCHEDULE V—VALUATION AND QUALIFYING ACCOUNTS (in millions)
|  |  |  | Additions |  |  |  |
Description |  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
2016 |  |  |  |  |  |  |  |  |  |
Valuation allowance for deferred income taxes |  | $ | 127.1 |  |  | $ | 11.0 |  |  | $ | (4.7 | ) |  | $ | — |  |  | $ | 133.4 |
Valuation allowance for mortgage loans |  | 6.8 |  |  | 0.9 |  |  | — |  |  | — |  |  | 7.7 |
2015 |  |  |  |  |  |  |  |  |  |
Valuation allowance for deferred income taxes |  | $ | 112.0 |  |  | $ | 23.7 |  |  | $ | (8.6 | ) |  | $ | — |  |  | $ | 127.1 |
Valuation allowance for mortgage loans |  | 6.5 |  |  | 0.3 |  |  | — |  |  | — |  |  | 6.8 |
2014 |  |  |  |  |  |  |  |  |  |
Valuation allowance for deferred income taxes |  | $ | 102.2 |  |  | $ | 15.9 |  |  | $ | (6.1 | ) |  | $ | — |  |  | $ | 112.0 |
Valuation allowance for mortgage loans |  | 10.1 |  |  | (0.9 | ) |  | — |  |  | 2.7 |  |  | 6.5 |

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- Definition A schedule of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements, table text block. + References No definition available. + Details
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Namespace Prefix: | rga_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration