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Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) - Cash Flow Hedging $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) contract
8 forward starting interest rate swaps (30-year), 1.38% |
Interest Rate Derivatives [Abstract] |
Number of interest rate derivatives | contract | 8
Term of derivative contract | 30 years
8 forward starting interest rate swaps (30-year), 0.73% |
Interest Rate Derivatives [Abstract] |
Number of interest rate derivatives | contract | 8
Term of derivative contract | 30 years
Notional amount of derivatives | $ | $ 200
Average rate locked (percent) | 0.73%
Eight Forward Starting Thirty Year Interest Rate Swaps 1.38 Percent |
Interest Rate Derivatives [Abstract] |
Notional amount of derivatives | $ | $ 200
Average rate locked (percent) | 1.38%

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