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Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2020
Credit Loss [Abstract] |
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block] | The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on loss and loss expenses:
Three Months Ended |
| March 31 |
(in millions of U.S. dollars) | 2020 |
Reinsurance recoverable |
Valuation allowance for uncollectible reinsurance - beginning of period | $ | 316 |
Provision for uncollectible reinsurance | 2 |
Write-offs charged against the valuation allowance | (13 | )
Valuation allowance for uncollectible reinsurance - end of period | $ | 305 |

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- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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