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Leases Lease (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 128    
Finance Lease, Liability, Payments, Due Next Twelve Months 35    
Operating Lease, Payments 136 $ 151 $ 150
Operating Lease, Cost 180 185 180
Lessee, Finance and Operating Lease, Lease Not Yet Commenced, Amount $ 0    
Aircraft Leases, Minimum Remaining Lease Term 1 month    
Aircraft Leases, Maximum Remaining Lease Term 6 years    
Operating Lease, Right-of-Use Asset $ 912 1,056  
Finance Lease, Right-of-Use Asset 171 181  
Lease, Right-of-Use Asset 1,083 1,237  
Operating Lease, Liability, Current (128) (133)  
Finance Lease, Liability, Current 31 18  
Operating Lease, Liability, Noncurrent 690 798  
Finance Lease, Liability, Noncurrent 58 89  
Lease, Liability $ 907 $ 1,038  
Operating Lease, Weighted Average Remaining Lease Term 11 years 11 years  
Finance Lease, Weighted Average Remaining Lease Term 3 years 4 years  
Operating Lease, Weighted Average Discount Rate, Percent 5.95% 5.95%  
Finance Lease, Weighted Average Discount Rate, Percent 4.75% 4.73%  
Facility Leases, Minimum Lease Term Remaining 8 months    
Facility Leases, Maximum Lease Term Remaining 15 years    
Short-term Lease, Cost $ 2 $ 2 2
Finance Lease, Right-of-Use Asset, Amortization 9 10 10
Finance Lease, Interest Expense 3 3 4
Variable Lease, Cost 391 379 358
Sublease Income (19) (15) (14)
Lease, Cost 566 564 540
Finance Lease, Interest Payment on Liability 5 5 6
Finance Lease, Principal Payments 17 17 $ 16
Lessee, Operating Lease, Liability, Payments, Due Year Two 122    
Finance Lease, Liability, Payments, Due Year Two 39    
Lessee, Operating Lease, Liability, Payments, Due Year Three 114    
Finance Lease, Liability, Payments, Due Year Three 9    
Lessee, Operating Lease, Liability, Payments, Due Year Four 104    
Finance Lease, Liability, Payments, Due Year Four 9    
Lessee, Operating Lease, Liability, Payments, Due Year Five 95    
Finance Lease, Liability, Payments, Due Year Five 5    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 565    
Finance Lease, Liability, Payments, Due after Year Five 0    
Lessee, Operating Lease, Liability, Payments, Due 1,128    
Finance Lease, Liability, Payment, Due 97    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (310)    
Finance Lease, Liability, Undiscounted Excess Amount 8    
Operating Lease, Liability 818    
Finance Lease, Liability $ 89 $ 107