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	$ 1,758	$ 1,464
Cash Flow from Investing Activities:
Capital expenditures, including aircraft lease deposits	(2,391)	(1,145)
Net decrease (increase) in short-term investments	(2,635)	0
Net decrease (increase) in restricted cash and short-term investments	(85)	(109)
Proceeds from sale of equipment, property, and investments/subsidiaries	22	57
Net cash provided by (used in) investing activities	(5,089)	(1,197)
Cash Flow from Financing Activities:
Payments on long-term debt and capital lease obligations	(2,052)	(990)
Proceeds from:
Issuance of debt	4,082	0
Sale-leaseback transactions	1,496	853
Funds transferred to affiliates, net	43	94
Other	0	0
Net cash provided by (used in) financing activities	3,569	(43)
Net increase in cash	238	224
Cash at beginning of period	474	280
Cash at end of period	$ 712	$ 504