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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 USD ($) | Mar. 31, 2020 | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) Customer | Dec. 31, 2019 USD ($) Customer | Dec. 31, 2018 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Settlement of long-term obligations duration |  |  |  |  | 13 years |  |
Number of customers | Customer |  |  |  |  | 2 | 0 | 1
Derivative collateral held |  |  |  |  | $ 0 |  |
Cash collateral posted |  |  |  |  | 0 |  |
Restricted cash |  |  |  |  | 190,000,000 | $ 380,000,000 | $ 32,000,000
Right-of-use assets |  |  |  |  | 223,000,000 | 243,000,000 |
Lease liabilities |  |  |  |  | 255,000,000 | 261,000,000 |
Decrease in trading price of common stock |  |  | 0.73 |  |  |  |
Foreign currency translation adjustment | [1] |  |  |  |  | $ 1,237,000,000 |
Canadian Business Segment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  |  | $ 170,000,000 |  |
Foreign currency translation adjustment |  |  |  | $ 1,200,000,000 |  |  |
ASU 2016-02 [Member] | Effect of Adoption of Lease Accounting [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Right-of-use assets |  | $ 410,000,000 |  |  |  |  |
Lease liabilities |  | 380,000,000 |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 8,000,000 |  |  |  |  |
Cumulative effect on retained earnings |  | $ 7,000,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other property and equipment, useful life |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other property and equipment, useful life |  |  |  |  | 60 years |  |
Customer Concentration Risk [Member] | One Customer [Member] | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 13.00% | 10.00% | 11.00%
Customer Concentration Risk [Member] | Two Customer [Member] | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00% |  |
Upstream Revenues [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of days allowed for payment from end of production month |  |  |  |  | 30 days |  |
Marketing Revenues [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of days allowed for payment of invoiced amount |  |  |  |  | 30 days |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  | $ 1,200,000,000 |
CDM [Member] | QL Capital Partners, LP [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash distribution received |  |  |  |  | $ 14,000,000 | 100,000,000 |
Future capital commitments |  |  |  |  |  | 40,000,000 |
Capital Increase Commitment Received |  |  |  |  | 37,000,000,000 |  |
Cash contributed to entities |  |  |  |  | $ 21,000,000 | $ 116,000,000,000 |
[1] | In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.

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