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Derivative and Financial Instruments - FX Notional (Details) | 12 Months Ended |  |
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Dec. 31, 2019 CAD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 USD ($)
Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities |  | In December 2017, we entered into foreign exchange zero cost collars buying the right to sell $1.25 billion CAD at $0.707 CAD and selling the right to buy $1.25 billion CAD at $0.842 CAD against the U.S. dollar. The collar expired during the second quarter of 2019 and we entered into new foreign currency exchange forward contracts to sell $1.35 billion CAD at $0.748 CAD against the U.S. dollar. |  |  |  |  |
Sell U.S. dollar, buy British pound. | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |
Net notional position of foreign currency exchange derivatives | $ |  |  |  | $ 0 |  |  | $ 805,000,000
Buy British Pound Sell Euro [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |
Net notional position of foreign currency exchange derivatives | £ |  |  | £ 4,000,000 |  |  | £ 0 |
Sell British pound, buy other currencies [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |
Net notional position of foreign currency exchange derivatives | £ | [1] |  | £ 0 |  |  | £ 21,000,000 |
Sell Canadian dollar, buy U.S. dollar [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |  |  |  |  |
Net notional position of foreign currency exchange derivatives | $ |  | $ 1,337,000,000 |  |  | $ 1,242,000,000 |  |
[1] | *Primarily euro and Norwegian krone.

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