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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 2,244 $ 2,181 $ 1,136
Adjustments to reconcile net income to cash provided by (used in) operating activities:      
Depreciation and amortization 1,221 1,015 938
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 21 0 0
Unrealized Gain (Loss) on Derivatives (200) 113 279
Increase (Decrease) in Deferred Income Taxes 455 (109) 501
Changes in certain assets and liabilities:      
Accounts and other receivables (50) (88) 54
Other assets (119) 103 142
Accounts payable and accrued liabilities 226 961 36
Air traffic liability 125 94 326
Cash collateral received from (provided to) derivative counterparties 535 (570) (233)
Other, net (165) (462) (277)
Net cash provided by operating activities 4,293 3,238 2,902
Net cash used in investing activities      
Capital expenditures (2,038) (2,041) (1,748)
Assets constructed for others (109) (102) (80)
Purchases of short-term investments (2,388) (1,986) (3,080)
Proceeds from sale of short-term investments 2,263 2,223 3,185
Other, net 0 (7) (4)
Net cash used in investing activities (2,272) (1,913) (1,727)
Net cash used in financing activities      
Proceeds from issuance of long-term debt 515 500 300
Proceeds from Employee stock plans 29 46 110
Reimbursement for assets constructed for others 107 24 27
Proceeds from termination of interest rate derivative instrument 0 12 0
Payments of long-term debt and capital lease obligations (523) (213) (561)
Payments of convertible debt (68) 0 0
Payments of cash dividends (222) (180) (139)
Repayment of construction obligation (9) (10) (11)
Repurchase of common stock (1,750) (1,180) (955)
Other, net (3) (23) (19)
Net cash used in financing activities (1,924) (1,024) (1,248)
NET CHANGE IN CASH AND CASH EQUIVALENTS 97 301 (73)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,583 1,282 1,355
CASH AND CASH EQUIVALENTS AT END OF PERIOD 1,680 1,583 1,282
CASH PAYMENTS FOR:      
Interest, net of amount capitalized 100 105 128
Income taxes 902 1,440 155
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:      
Flight equipment acquired through the assumption of debt 20 0 0
Flight equipment under capital leases 307 193 153
Assets constructed for others $ 196 $ 192 $ 88