v3.19.3.a.u2
Non Mineral Leases - Intro (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finance Lease Obligations $ 720 $ 777
Operating Lease, Liability $ 932  
Co Venturer Member    
FInance lease net assets consolidated on a proportionate basis   420
Finance Lease Obligations   688
Operating Lease, Right-of-Use Asset   $ 57
Lease, Practical Expedients, Package [true false] true  
Lease Practical Expedient Lessor Single Lease Component true