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Derivative financial instruments (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |
Derivative cash collateral, advanced to counterparties | $ 0 | $ 0
Cash flow hedge gain (loss) to be reclassified within 12 months | $ 48,000,000 |
Minimum |  |
Derivative [Line Items] |  |
Derivative, variable benchmark interest duration | 1 month |
Maximum |  |
Derivative [Line Items] |  |
Derivative, variable benchmark interest duration | 6 months |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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