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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Derivative [Line Items] |  |  |  |  |  |
Net unrealized gains (losses) arising during the period | $ (48,332,000) | $ (1,923,000) |  | $ (184,310,000) | $ (30,980,000) |
Unrealized gain, after tax | (36,815,000) | (1,437,000) |  | (140,432,000) | (22,620,000) |
Income recognized | 1,000,000 | $ 3,700,000 |  | 3,200,000 | $ 5,300,000 |
Cash flow hedge gain (loss) to be reclassified |  |  |  | 84,000,000 |  |
Cash flow hedge termination gain |  |  |  | 2,000,000 |  |
Collateral requirements | 31,600,000 |  |  | 31,600,000 |  | $ 64,500,000
Variation margin, amount reducing derivative asset | 37,000,000 |  |  | 37,000,000 |  | $ 94,600,000
Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net unrealized gains (losses) arising during the period | 0 |  | $ 757,000 | 0 |  |
Unrealized gain, after tax |  |  | $ 565,000 |  |  |
Cash Flow Hedges | Forward-Starting Cash Flow Hedges Added In Q2 QTD 2022 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Increase in derivative, notional amount | $ 250,000,000 |  |  |  |  |
Cash Flow Hedges | Forward-Starting Cash Flow Hedges Added In Q2 YTD 2022 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Increase in derivative, notional amount |  |  |  | $ 1,650,000,000 |  |

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