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Leases Components of Lease Cost (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Aircraft rentals $ 43 [1]
Short-term Lease, Cost 1
Variable Lease, Cost 330
Sublease Income (25)
Finance Lease, Right-of-Use Asset, Amortization 29
Finance Lease, Interest Expense 7
Lease, Cost 432
Other Property  
Operating Lease, Cost $ 22
[1] Net of sublease income of $25 million