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Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Leases [Abstract]  
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Capital Leases
Years Ending December 31,
(in millions)
Total
2013
$
209

2014
173

2015
158

2016
164

2017
97

Thereafter
113

Total minimum lease payments
914

Less: amount of lease payments representing interest
(313
)
Present value of future minimum capital lease payments
601

Plus: unamortized premium
2

Less: current obligations under capital leases
(120
)
Long-term capital lease obligations
$
483
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Operating Leases
Years Ending December 31,
(in millions)
Delta Lease Payments(1)
Contract Carrier Aircraft Lease Payments(2)
Total
2013
$
1,005

$
502

$
1,507

2014
949

484

1,433

2015
859

473

1,332

2016
736

423

1,159

2017
627

373

1,000

Thereafter
6,414

1,001

7,415

Total minimum lease payments
$
10,590

$
3,256

$
13,846