Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (94)	$ 387
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	311	297
Unrealized/realized (gain) loss on fuel derivative instruments	2	0
Deferred income taxes	(49)	13
Changes in certain assets and liabilities:
Accounts and other receivables	183	(222)
Other assets	58	29
Accounts payable and accrued liabilities	(1,291)	(257)
Air traffic liability	701	944
Other liabilities	(132)	(69)
Cash collateral received from (provided to) derivative counterparties	(5)	15
Other, net	(61)	(32)
Net cash provided by (used in) operating activities	(377)	1,105
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(224)	(160)
Supplier Proceeds	300	0
Purchases of short-term investments	(1,029)	(251)
Proceeds from sales of short-term and other investments	948	575
Net cash provided by (used in) investing activities	(5)	164
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	500	0
Proceeds from revolving credit facility	1,000	0
Proceeds from term loan credit facility	1,000	0
Proceeds from Employee stock plans	11	10
Payments of long-term debt and finance lease obligations	(78)	(99)
Payments of cash dividends	(188)	(178)
Repurchase of common stock	(451)	(500)
Other, net	(20)	(12)
Net cash provided by (used in) financing activities	1,774	(779)
NET CHANGE IN CASH AND CASH EQUIVALENTS	1,392	490
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,548	1,854
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,940	2,344
CASH PAYMENTS FOR:
Interest, net of amount capitalized	14	15
Income taxes	5	4
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS
Right-of-use assets acquired under operating leases	25	119
Right-of-use assets acquired under finance leases	0	1
Assets constructed for others	$ 34	$ 21