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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 3,488 $ 2,244 $ 2,181
Adjustments to reconcile net income to cash provided by (used in) operating activities:      
Depreciation and amortization 1,218 1,221 1,015
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0 21 0
Aircraft grounding charge 63 0 0
Unrealized Gain (Loss) on Derivatives (50) (200) 113
Increase (Decrease) in Deferred Income Taxes (1,212) 455 (109)
Changes in certain assets and liabilities:      
Accounts and other receivables (102) (50) (88)
Other assets (262) (119) 103
Accounts payable and accrued liabilities 246 226 961
Air traffic liability 345 125 94
Cash collateral received from (provided to) derivative counterparties 316 535 (570)
Other, net (121) (165) (462)
Net cash provided by operating activities 3,929 4,293 3,238
Net cash used in investing activities      
Capital expenditures (2,123) (2,038) (2,041)
Assets constructed for others (126) (109) (102)
Purchases of short-term investments (2,380) (2,388) (1,986)
Proceeds from sale of short-term investments 2,221 2,263 2,223
Other, net 0 0 (7)
Net cash used in investing activities (2,408) (2,272) (1,913)
Net cash used in financing activities      
Proceeds from issuance of long-term debt 600 515 500
Proceeds from Employee stock plans 29 29 46
Reimbursement for assets constructed for others 126 107 24
Proceeds from termination of interest rate derivative instrument 0 0 12
Payments of long-term debt and capital lease obligations (592) (523) (213)
Payments of convertible debt 0 (68) 0
Payments of cash dividends (274) (222) (180)
Repayment of construction obligation (10) (9) (10)
Repurchase of common stock (1,600) (1,750) (1,180)
Other, net 15 (3) (23)
Net cash used in financing activities (1,706) (1,924) (1,024)
NET CHANGE IN CASH AND CASH EQUIVALENTS (185) 97 301
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,680 1,583 1,282
CASH AND CASH EQUIVALENTS AT END OF PERIOD 1,495 1,680 1,583
CASH PAYMENTS FOR:      
Interest, net of amount capitalized 81 100 105
Income taxes 992 902 1,440
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:      
Flight equipment acquired through the assumption of debt 0 20 0
Flight equipment under capital leases 233 307 193
Assets constructed for others $ 197 $ 196 $ 192