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Leases Components of Lease Cost (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2019	Sep. 30, 2019
Short-term Lease, Cost		$ 1	$ 3
Variable Lease, Cost		337	1,016
Sublease Income		(25)	(75)
Finance Lease, Right-of-Use Asset, Amortization		29	87
Finance Lease, Interest Expense		6	20
Lease, Cost		439	1,324
Aircraft
Operating Lease, Cost	[1]	44	132
Other Property
Operating Lease, Cost		$ 22	$ 66
[1] Net of sublease income of $25 million and $75 million for the three and nine months ended September 30, 2019, respectively.

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Amount of interest expense on finance lease liability.

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