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Non-Mineral Leases - End Notes (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net	$ 44,334	$ 45,698
Short-term Lease Commitment, Amount	77
Short Term Lease Commitment Lease Not Commenced	65
Property plant equipment | Corporate Joint Venture [Member]
Property, Plant and Equipment, Net	376
Short term debt | Corporate Joint Venture [Member]
Finance Lease, Liability, Current	$ 55
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Debt, Current
Long-term Debt | Corporate Joint Venture [Member]
Finance Lease, Liability, Noncurrent	$ 609
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term Debt and Capital Lease Obligations

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- Definition

Amount of short term lease commitment related to leases which have not yet commenced.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Indicates line item in statement of financial position that includes current finance lease liability.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of short-term lease commitment.

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