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Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 62	$ 39
Finance lease cost
Amortization of right-of-use assets	59	1
Interest on lease liabilities	3	0
Lease, cost	124	40
Variable lease cost included within operating lease cost	11	$ 13
Accelerated amortization expense included within finance lease expense	$ 38

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Finance Lease, Cost 1 [Abstract]

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Finance Lease, Right-Of-Use Asset, Accelerated Amortization

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- Definition

Amount of interest expense on finance lease liability.

+ References

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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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.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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