Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Property, Plant and Equipment [Table Text Block]

The following table shows our property and equipment:

		December 31,
(in millions, except for estimated useful life)	Estimated Useful Life	2013			2012
Flight equipment	21-30 years	$	23,373		$	21,481
Ground property and equipment	3-40 years	4,596			4,254
Flight and ground equipment under capital leases	Shorter of lease term or estimated useful life	1,296			1,381
Advance payments for equipment		381			253
Less: accumulated depreciation and amortization(1)		(7,792		)	(6,656		)
Total property and equipment, net		$	21,854		$	20,713

⁽¹⁾ Includes accumulated amortization for flight and ground equipment under capital leases in the amount of $657 million and $653 million at December 31, 2013 and 2012, respectively.