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Non-Mineral Leases - Other Info (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 91	$ 166
Amortization of right-of-use assets	29	58
Interest on lease liabilities	9	19
Short-term Lease Cost	16	30
Lease Cost Total	$ 145	$ 273
Weighted-average term (years) - Operating Leases	5 years 6 months 21 days	5 years 6 months 21 days
Weighted-average term (years) - Finance Leases	9 years 2 months 15 days	9 years 2 months 15 days
Weighted Average Discount Rate (Percent) - Operating Leases	338.00%	338.00%
Weighted Average Discount Rate (Percent) - Finance Leases	577.00%	577.00%
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases		$ 101
Operating cash flows from finance leases		20
Financing cash flows from finance leases		37
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		228
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 0

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