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Leases Components of Lease Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Short-term Lease, Cost $ 1 $ 2
Variable Lease, Cost 349 679
Sublease Income (25) (50)
Finance Lease, Right-of-Use Asset, Amortization 29 58
Finance Lease, Interest Expense 7 14
Lease, Cost 452 885
Aircraft    
Operating Lease, Cost [1] 44 88
Other Property    
Operating Lease, Cost $ 22 $ 44
[1] Net of sublease income of $25 million and $50 million for the three and six months ended June 30, 2019, respectively.