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Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of future minimum lease payments for capital leases The following tables summarize our minimum rental commitments under capital leases and noncancelable operating leases (including certain aircraft flown by regional carriers) with initial or remaining terms in excess of one year for the years succeeding December 31, 2017:

Capital Leases
(in millions)
Total
2018
$
116

2019
92

2020
65

2021
41

2022
24

Thereafter
126

Total minimum lease payments
464

Less: amount of lease payments representing interest
(70
)
Present value of future minimum capital lease payments
394

Less: current obligations under capital leases
(97
)
Long-term capital lease obligations
$
297
Schedule of future minimum rental payments for operating leases Operating Leases
(in millions)
Delta Lease Payments(1)
Contract Carrier Aircraft Lease Payments(2)
Total
2018
$
1,469

$
266

$
1,735

2019
1,322

267

1,589

2020
1,189

241

1,430

2021
983

173

1,156

2022
883

153

1,036

Thereafter
8,819

471

9,290

Total minimum lease payments
$
14,665

$
1,571

$
16,236


 
(1) 
Includes payments accounted for as construction obligations.
(2) 
Represents the minimum lease obligations under our contract carrier agreements with Compass Airlines, LLC, ExpressJet Airlines, Inc., GoJet Airlines, LLC, Republic Airline, Inc. and SkyWest Airlines, Inc.