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	$ 1,825	$ 1,652
Cash Flow from Investing Activities:
Capital expenditures, including aircraft lease deposits	(1,799)	(728)
Net decrease (increase) in short-term investments	(2,196)	(891)
Net decrease (increase) in restricted cash and short-term investments	(13)	(34)
Proceeds from sale of equipment, property, and investments/subsidiaries	22	56
Net cash provided by (used in) investing activities	(3,986)	(1,597)
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
Funds transferred to affiliates, net	16	66
Other	5	0
Net cash provided by (used in) financing activities	2,286	32
Net increase (decrease) in cash	125	87
Cash at beginning of period	474	280
Cash at end of period	$ 599	$ 367