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Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) - 8 forward starting interest rate swaps (30-year), 3.06% - Cash flow hedge $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($) contract
Interest Rate Risk Hedging |
Number of interest rate derivatives | contract | 8
Term of derivative contract | 30 years
Notional amount of derivatives | $ | $ 200
Average rate locked (percent) | 3.06%

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