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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) - 12 months ended Dec. 31, 2018 $ in Millions, $ in Millions | USD ($) contract $ / $ | CAD ($) contract $ / $
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2.83%, 8 forward starting swaps (30-year) | Cash Flow Hedging |  |
Currency Exchange Rate Risk Hedging: |  |
Number of interest rate derivatives | contract | 8 | 8
Term of derivative contract | 30 years |
Notional amount of derivatives | $ | $ 200 |
Average rate locked (percent) | 2.83% | 2.83%
3.06%, 8 forward starting swaps (30-year) | Cash Flow Hedging |  |
Currency Exchange Rate Risk Hedging: |  |
Number of interest rate derivatives | contract | 8 | 8
Term of derivative contract | 30 years |
Notional amount of derivatives | $ | $ 200 |
Average rate locked (percent) | 3.06% | 3.06%
Forward exchange contracts that exchange CAD for USD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 3 | $ 4
Average exchange rate (cad per usd) | $ / $ | 1.34 | 1.34
Forward exchange contracts that exchange USD for CAD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 218 | $ 284
Average exchange rate (cad per usd) | $ / $ | 1.31 | 1.31

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