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Leases (Lease costs) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019
Leases
Operating lease costs		$ 25
Short-term lease costs		13
Finance lease costs, amortization of right-of-use assets		21
Finance lease costs, interest on lease liabilities		39
Total lease costs		98
Operating lease impairment	$ 26	$ 26

X

- Definition

Amount of interest expense on finance lease liability.

+ References

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X

- Definition

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

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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No definition available.

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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.

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X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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