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Reinsurance (Notes) | 3 Months Ended
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Mar. 31, 2021
Reinsurance Disclosures [Abstract] |
Reinsurance [Text Block] | Reinsurance Reinsurance recoverable on ceded reinsurance
|  | March 31, 2021 |  | December 31, 2020
(in millions of U.S. dollars) | Net Reinsurance Recoverable (1) |  | Valuation allowance | Net Reinsurance Recoverable (1) |  | Valuation allowance
Reinsurance recoverable on unpaid losses and loss expenses | $ | 14,860 |  |  | $ | 258 |  |  | $ | 14,647 |  |  | $ | 257 |
Reinsurance recoverable on paid losses and loss expenses | 1,054 |  |  | 59 |  |  | 945 |  |  | 57 |
Reinsurance recoverable on losses and loss expenses | $ | 15,914 |  |  | $ | 317 |  |  | $ | 15,592 |  |  | $ | 314 |
Reinsurance recoverable on policy benefits | $ | 202 |  |  | $ | 4 |  |  | $ | 206 |  |  | $ | 5 |
(1)Net of valuation allowance for uncollectible reinsurance. The increase in reinsurance recoverable on losses and loss expenses was primarily due to unfavorable prior period development in certain lines and catastrophe losses in the quarter. 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) | 2021 |  | 2020
Valuation allowance for uncollectible reinsurance - beginning of period | $ | 314 |  |  | $ | 316 |
Provision for uncollectible reinsurance | 3 |  |  | 2 |
Write-offs charged against the valuation allowance | — |  |  | (13) |
Valuation allowance for uncollectible reinsurance - end of period | $ | 317 |  |  | $ | 305 |
For additional information, refer to Note 1 d) to the Consolidated Financial Statements of our 2020 Form 10-K.

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- Definition The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -URI http://asc.fasb.org/topic&trid=2303980 + Details
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