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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions | Sep. 30, 2019 USD ($) $ / $ | Sep. 30, 2019 CAD ($) $ / $
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Forward exchange contracts that exchange CAD for USD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 42 | $ 56
Average exchange rate (cad per usd) | 1.32 | 1.32
Forward exchange contracts that exchange USD for CAD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 98 | $ 130
Average exchange rate (cad per usd) | 1.32 | 1.32

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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