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Commitments, Contingencies And Guarantees - Contingencies (Details) - Dec. 31, 2018 $ in Millions, $ in Millions | USD ($) | CAD ($)
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Commitments, Contingencies and guarantees |  |
Insurance coverage | $ 400 |
Maximum potential amount payable under indemnification agreements |  | $ 125
Oil sands risks |  |
Commitments, Contingencies and guarantees |  |
Insurance coverage | 1,200 |
Offshore risks |  |
Commitments, Contingencies and guarantees |  |
Insurance coverage | 975 |
Refining risks |  |
Commitments, Contingencies and guarantees |  |
Insurance coverage | $ 1,200 |

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