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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net income $ 659 $ 615 $ 1,787 $ 1,811
Adjustments to reconcile net income to cash provided by (used in) operating activities:        
Depreciation and amortization 308 301 906 870
Unrealized/realized gains on fuel derivative instruments 0 (2) 0 (13)
Deferred income taxes 174 104 224 308
Changes in certain assets and liabilities:        
Accounts and other receivables (88) (13) (292) (109)
Other assets 79 (30) 195 (243)
Accounts payable and accrued liabilities 106 161 (240) 80
Air traffic liability (17) 52 897 1,018
Other liabilities (87) 0 (210) 0
Cash collateral received from derivative counterparties 0 10 0 150
Other, net (43) 73 (104) 32
Net cash provided by operating activities 1,091 1,271 3,163 3,904
CASH FLOWS FROM INVESTING ACTIVITIES:        
Capital expenditures (375) (454) (766) (1,384)
Assets constructed for others 0 (8) 0 (49)
Purchases of short-term investments (529) (678) (1,329) (1,607)
Proceeds from sales of short-term and other investments 545 531 1,648 1,665
Other, net 0 5 0 5
Net cash used in investing activities (359) (604) (447) (1,370)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from Employee stock plans 9 9 29 26
Reimbursement for assets constructed for others 0 8 0 165
Payments of long-term debt and finance lease obligations (70) (98) (245) (255)
Payments of cash dividends (96) (91) (372) (332)
Repayment of construction obligation 0 (8) 0 (22)
Repurchase of common stock (500) (500) (1,450) (1,500)
Other, net (33) 3 (44) (7)
Net cash used in financing activities (690) (677) (2,082) (1,925)
NET CHANGE IN CASH AND CASH EQUIVALENTS 42 (10) 634 609
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 2,446 2,114 1,854 1,495
CASH AND CASH EQUIVALENTS AT END OF PERIOD 2,488 2,104 2,488 2,104
CASH PAYMENTS FOR:        
Interest, net of amount capitalized 11 18 59 70
Income taxes 169 38 487 212
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS        
Flight equipment under finance leases 0 18 0 32
Assets constructed for others $ 28 $ 46 $ 73 $ 126