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Leases (Narrative) (Details) - USD ($) $ in Millions		Jan. 01, 2019	Jun. 30, 2019
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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