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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