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Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 2,465 $ 3,357 $ 2,183
Adjustments to reconcile net income to cash provided by (used in) operating activities:      
Depreciation and amortization 1,201 1,218 1,221
Loss on asset impairment 0 0 21
Aircraft grounding charge 0 63 0
Unrealized/realized gains on fuel derivative instruments (14) (50) (200)
Deferred income taxes (301) 1,066 (419)
Changes in certain assets and liabilities:      
Accounts and other receivables 117 (102) (50)
Other assets (227) (262) (119)
Accounts payable and accrued liabilities 545 233 221
Air traffic liability 506 343 227
Cash collateral received from (provided to) derivative counterparties (15) 316 535
Other, net 14 (121) (165)
Net cash provided by operating activities 4,893 3,929 4,293
Net cash used in investing activities      
Capital expenditures (1,922) (2,123) (2,038)
Assets constructed for others (54) (126) (109)
Purchases of short-term investments (2,409) (2,380) (2,388)
Proceeds from sale of short-term and other investments 2,342 2,221 2,263
Other, net 5 0 0
Net cash used in investing activities (2,038) (2,408) (2,272)
Net cash used in financing activities      
Proceeds from issuance of long-term debt 0 600 515
Proceeds from Employee stock plans 35 29 29
Reimbursement for assets constructed for others 170 126 107
Payments of long-term debt and capital lease obligations (342) (592) (523)
Payments of convertible debt 0 0 (68)
Payments of cash dividends 332 274 222
Repayment of construction obligation (30) (10) (9)
Repurchase of common stock (2,000) (1,600) (1,750)
Other, net 3 15 (3)
Net cash used in financing activities (2,496) (1,706) (1,924)
NET CHANGE IN CASH AND CASH EQUIVALENTS 359 (185) 97
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 1,495 1,680 1,583
CASH AND CASH EQUIVALENTS AT END OF PERIOD 1,854 1,495 1,680
CASH PAYMENTS FOR:      
Interest, net of amount capitalized 107 81 100
Income taxes 327 992 902
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:      
Flight equipment acquired through the assumption of debt 0 0 20
Flight equipment under capital leases 32 233 307
Assets constructed for others $ 171 $ 197 $ 196