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Fair Value Measurement - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 18, 2018
--- | --- | --- | ---
Financial Assets |  |  |
Investment in Cenovus Energy | $ 2,111 | $ 1,462 |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 126 | 161 |
Carrying Amount [Member] |  |  |
Financial Assets |  |  |
Investment in Cenovus Energy | 2,111 | 1,462 |
Available for sale debt securities at fair value | 241 |  | $ 0
Total loans and advances - related parties | 339 | 468 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Total debt, excluding capital leases | 14,175 | 14,191 |
Carrying Amount [Member] | Commodity Contract [Member] |  |  |
Financial Assets |  |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 125 | 170 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Commodity derivatives | 106 | $ 110 |
Fair Value [Member] |  |  |
Financial Assets |  |  |
Investment in Cenovus Energy | 2,111 |  | 1,462
Available for sale debt securities at fair value | 241 |  | 0
Total loans and advances - related parties | 339 |  | 468
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Total debt, excluding capital leases | 18,108 |  | 16,147
Fair Value [Member] | Commodity Contract [Member] |  |  |
Financial Assets |  |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 125 |  | 170
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |
Commodity derivatives | $ 106 |  | $ 110

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