Leases Components of operating and finance lease expense (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended |
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Sep. 30, 2019 |
Sep. 30, 2019 |
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| Components of our operating and finance lease expense [Abstract] | ||
| Operating Lease, Cost | $ 11 | $ 34 |
| Finance Lease, Right-of-Use Asset, Amortization | 2 | 6 |
| Finance Lease, Interest Expense | 2 | 6 |
| Finance lease, expense, Total | 4 | 12 |
| Variable Lease, Cost | 3 | 8 |
| Lease, Cost | $ 18 | $ 54 |
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- Definition Components of our operating and finance lease expense [Abstract] No definition available.
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- Definition Finance lease, expense, Total No definition available.
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- Definition Amount of interest expense on finance lease liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of amortization expense attributable to right-of-use asset from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of lease cost recognized by lessee for lease contract. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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