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Risk Management - Foreign Currency Risk Management (Details) $ in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
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Cash Flow Hedging | Cross Currency Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,358 |  |
Net Investment Hedging | Foreign currency contracts |  |  |
Derivative [Line Items] |  |  |
Notional amount |  | $ 1,888 | $ 2,450

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