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Derivatives and Risk Management Activities - Rate Risk Hedging (Details) - 12 months ended Dec. 31, 2019 $ in Millions, $ in Millions	USD ($) contract $ / $	CAD ($) contract $ / $
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 | $	$ 200
Average rate locked (percent)	3.06%	3.06%
Forward exchange contracts that exchange CAD for USD maturing in 2020
Currency Exchange Rate Risk Hedging:
Notional amount	$ 202	$ 266
Forward exchange contracts that exchange CAD for USD maturing in 2020 | Minimum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.00	1.00
Forward exchange contracts that exchange CAD for USD maturing in 2020 | Maximum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.31	1.31
Forward exchange contracts that exchange USD for CAD maturing in 2020
Currency Exchange Rate Risk Hedging:
Notional amount	$ 207	$ 274
Forward exchange contracts that exchange USD for CAD maturing in 2020 | Minimum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.00	1.00
Forward exchange contracts that exchange USD for CAD maturing in 2020 | Maximum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.32	1.32

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Average fixed interest rate related to the group of interest rate derivatives.

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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
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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