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Allowance for credit losses (Tables) | 12 Months Ended
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Dec. 31, 2021
Credit Loss [Abstract] |
Allowance for credit losses | Movements in the allowance for credit losses during the years ended December 31, 2021 and 2020 were as follows:
| Year Ended December, 31
| 2021 |  | 2020
| Investment in finance leases |  | Notes receivable |  | Loans receivable |  | Total |  | Total
Allowance for credit losses at beginning of period | $ | 59,663 |  |  | $ | 7,490 |  |  | $ | — |  |  | $ | 67,153 |  |  | $ | — |
Initial credit provision related to GECAS purchased financial assets with credit deterioration | 9,944 |  |  | — |  |  | 1,423 |  |  | 11,367 |  |  | — |
Cumulative effect due to adoption of new accounting standard | — |  |  | — |  |  | — |  |  | — |  |  | 30,264 |
Current period provision for expected credit losses | 1,685 |  |  | 78,144 |  |  | 3,868 |  |  | 83,697 |  |  | 50,215 |
Write-offs charged against the allowance | — |  |  | (44,670) |  |  | — |  |  | (44,670) |  |  | (13,326) |
Allowance for credit losses at end of period | $ | 71,292 |  |  | $ | 40,964 |  |  | $ | 5,291 |  |  | $ | 117,547 |  |  | $ | 67,153 |
Financing receivables grouped by credit risk | The table below presents Financing Receivables carried at amortized cost basis, gross of allowance for credit losses, grouped into the three credit risk categories. Category A is considered an excellent or high-credit-quality airline customer; Category B is considered a good-credit-quality airline customer; and those airline customers in Category C are considered marginal.
| As of December 31, 2021
| Category A |  | Category B |  | Category C |  | Total
| (U.S. Dollars in millions)
Investment in finance leases | $ | 534 |  |  | $ | 1,247 |  |  | $ | 219 |  |  | $ | 2,000 |
Notes receivable | — |  |  | 26 |  |  | 632 |  |  | 658 |
Loans receivable | 12 |  |  | 161 |  |  | 236 |  |  | 409 |
Total | $ | 546 |  |  | $ | 1,434 |  |  | $ | 1,087 |  |  | $ | 3,067 |

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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953659-111524 + Details
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