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Leases Components of Lease Cost (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Short-term Lease, Cost $ 4
Variable Lease, Cost 1,377
Sublease Income 97
Finance Lease, Right-of-Use Asset, Amortization 116
Finance Lease, Interest Expense 26
Lease, Cost 142
Aircraft  
Operating Lease, Cost 182 [1]
Other Property  
Operating Lease, Cost $ 89
[1] Net of sublease income of $97 million for the year ended December 31, 2019.