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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Derivative [Line Items] |  |  |
Net unrealized gains (losses) arising during the period | $ (135,978,000) | $ (29,057,000) |
Unrealized gain, after tax | (103,617,000) | (21,183,000) |
Income recognized | 2,200,000 | 1,600,000 |
Cash flow hedge gain (loss) to be reclassified | 26,000,000 |  |
Cash flow hedge termination gain | 3,000,000 |  |
Collateral requirements | 46,200,000 |  | $ 64,500,000
Variation margin, amount reducing derivative asset | 61,400,000 |  | $ 94,600,000
Cash Flow Hedges |  |  |
Derivative [Line Items] |  |  |
Net unrealized gains (losses) arising during the period | 0 | 757,000 |
Unrealized gain, after tax |  | $ 565,000 |
Cash Flow Hedges | Forward-Starting Cash Flow Hedges added in Q1 2022 |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,400,000,000 |  |

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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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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226038-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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