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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 351 $ 513
Adjustments to reconcile net income to cash provided by (used in) operating activities:    
Depreciation and amortization 318 290
Unrealized/realized (gain) loss on fuel derivative instruments 27 88
Deferred income taxes 62 26
Changes in certain assets and liabilities:    
Accounts and other receivables (35) (21)
Other assets (81) 4
Accounts payable and accrued liabilities 93 313
Air traffic liability 897 685
Cash collateral received from (provided to) derivative counterparties 37 (231)
Other, net (44) (51)
Net cash provided by operating activities 1,625 1,616
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (414) (438)
Assets constructed for others (49) (11)
Purchases of short-term investments (563) (256)
Proceeds from sales of short-term and other investments 556 530
Net cash used in investing activities (470) (175)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from Employee stock plans 7 11
Reimbursement for assets constructed for others 49 10
Payments of long-term debt and capital lease obligations (369) (56)
Payments of cash dividends (123) (96)
Repayment of construction obligation (2) (2)
Repurchase of common stock (550) (500)
Other, net 4 (3)
Net cash used in financing activities (984) (636)
NET CHANGE IN CASH AND CASH EQUIVALENTS 171 805
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,680 1,583
CASH AND CASH EQUIVALENTS AT END OF PERIOD 1,851 2,388
CASH PAYMENTS FOR:    
Interest, net of amount capitalized 27 27
Income taxes 6 73
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS    
Flight equipment under capital leases 39 169
Assets constructed for others $ 50 $ 60