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Non-Mineral Leases - Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]    
2019 $ 206  
2020 327  
2021 207  
2022 121  
2023 67  
Remaining Years 221  
Lessee, Operating Lease, Liability, Payments, Due, Total 1,149  
Finance Lease Liabilities, Payments, Due [Abstract]    
2019 58  
2020 115  
2021 100  
2022 98  
2023 84  
Remaining Years 461  
Finance Lease Liability, Payments, Due, Total $ 916  
Future Operating Lease Payments Under 840 [Abstract]    
2019   $ 248
2020   425
2021   136
2022   319
2023   54
Remaining Years   212
Operating Leases, Future Minimum Payments Due, Total   1,394
Less income from subleases   (7)
Net Minimum Operating Lease Payments   1,387
Capital Lease Obligations [Abstract]    
2019   118
2020   116
2021   100
2022   98
2023   87
Remaining Years   453
Capital Leases, Future Minimum Payments Due, Total   972
Less portion representing imputed interest   (195)
Finance Lease Obligations, Total   $ 777