Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Statement of Cash Flows [Abstract]
Net Cash Provided by Operating Activities	$ 1,803	$ 1,567
Cash Flow from Investing Activities:
Capital expenditures, including aircraft lease deposits	(2,400)	(1,153)
Net decrease (increase) in short-term investments	(2,634)	(85)
Net decrease (increase) in restricted cash and short-term investments	(85)	(24)
Proceeds from sale of equipment, property, and investments/subsidiaries	27	58
Net cash provided by (used in) investing activities	(5,092)	(1,204)
Cash Flow from Financing Activities:
Payments on long-term debt and capital lease obligations	(2,052)	(991)
Proceeds from:
Issuance of debt	4,082	0
Sale-leaseback transactions	1,496	853
Other	0	0
Net cash provided by (used in) financing activities	3,526	(138)
Net increase in cash	237	225
Cash at beginning of period	480	283
Cash at end of period	$ 717	$ 508