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Leases (Narrative) (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Jun. 30, 2019
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Operating Leased Assets [Line Items] |  |  |
Right-of-use assets |  |  | $ 273
Lease liabilities | [1] |  | $ 309
ASU 2016-02 [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Right-of-use assets |  | $ 394 |
Lease liabilities |  | 380 |
Cumulative effect on retained earnings, before tax |  | (24) |
Cumulative effect on retained earnings |  | $ (19) |
[1] | Under previous lease accounting standard, ASC 840, Devon’s lease obligations as of December 31, 2018 expiring in each of the next 5 years and thereafter were $61 million for 2019, $48 million for 2020, $18 million for 2021, $9 million for 2022, $8 million for 2023 and $33 million thereafter

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