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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Cash Flows [Abstract]    
Net Cash Provided by (used for) Operating Activities $ 683 $ 1,067
Cash Flow from Investing Activities:    
Capital expenditures, including aircraft lease deposits (885) (238)
Net (increase) decrease in short-term investments (226) (726)
Net (increase) decrease in restricted cash and short-term investments (3) (33)
Proceeds from sale of equipment and property 26 12
Net cash used for investing activities (1,088) (985)
Cash Flow from Financing Activities:    
Payments on long-term debt and capital lease obligations (394) (314)
Proceeds from:    
Issuance of debt 161 0
Sale leaseback transactions 764 324
Other 0 0
Net cash provided by financing activities 531 10
Net increase (decrease) in cash 126 92
Cash at beginning of period 480 283
Cash at end of period $ 606 $ 375