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Condensed Consolidated Statement of Cash Flows (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net income $ 329 $ 259 $ 946 $ 542
Adjustments to reconcile net income to cash provided by (used in) operating activities:        
Depreciation and amortization 238 221 687 643
Unrealized (gain) loss on fuel derivative instruments 63 (58) (4) (24)
Deferred income taxes 392 29 472 52
Changes in certain assets and liabilities:        
Accounts and other receivables (22) 73 (83) (74)
Other assets 6 (63) (7) (83)
Accounts payable and accrued liabilities (534) (98) (86) 185
Air traffic liability (108) (95) 806 811
Cash collateral paid to derivative counterparties (98) 80 8 56
Other, net (26) 80 (41) 80
Net cash provided by operating activities 240 428 2,698 2,188
CASH FLOWS FROM INVESTING ACTIVITIES:        
Capital expenditures 433 268 1,340 995
Purchases of short-term investments (415) (896) (2,344) (2,520)
Proceeds from sales of short-term and other investments 805 805 2,427 2,385
Payments for (Proceeds from) Other Investing Activities (1) 0 (2) 0
Net cash used in investing activities (44) (359) (1,259) (1,130)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from Employee stock plans 23 12 96 31
Reimbursement for assets constructed for others 26 0 26 0
Payments of long-term debt and capital lease obligations (48) (51) (167) (267)
Payments of cash dividends (41) (28) (138) (71)
Repayment of construction obligation (3) (2) (8) (3)
Repurchase of common stock (200) (150) (755) (501)
Other, net (3) (6) (16) (27)
Net cash used in financing activities (246) (225) (962) (838)
NET CHANGE IN CASH AND CASH EQUIVALENTS (50) (156) 477 220
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,882 1,489 1,355 1,113
CASH AND CASH EQUIVALENTS AT END OF PERIOD 1,832 1,333 1,832 1,333
CASH PAYMENTS FOR:        
Interest, net of amount capitalized 35 39 102 106
Income taxes 132 124 144 147
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS        
Assets constructed for others $ 27 $ 15 $ 59 $ 90