Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Cash Flows [Abstract]
Net Cash Provided by (used in) Operating Activities	$ 1,840	$ 1,722
Cash Flow from Investing Activities:
Capital expenditures, including aircraft lease deposits	(1,804)	(733)
Net decrease (increase) in short-term investments	(2,194)	(890)
Net decrease (increase) in restricted cash and short-term investments	(13)	(34)
Proceeds from sale of equipment, property, and investments/subsidiaries	26	57
Net cash provided by (used in) investing activities	(3,985)	(1,600)
Cash Flow from Financing Activities:
Payments on long-term debt and capital lease obligations	(551)	(602)
Proceeds from:
Issuance of debt	1,684	0
Sale-leaseback transactions	1,132	568
Other	4	0
Net cash provided by (used in) financing activities	2,269	(34)
Net increase (decrease) in cash	124	88
Cash at beginning of period	480	283
Cash at end of period	$ 604	$ 371