Non-Mineral Leases - Operating Lease Rentals (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Operating lease rental expense | ||
| Operating Leases, Rent Expense, Minimum Rentals | $ 253 | $ 264 |
| Less sublease rentals | (16) | (20) |
| Operating Leases, Rent Expense, Total | $ 237 | $ 244 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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| X | ||||||||||
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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| X | ||||||||||
- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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