Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 741	$ 733	$ 1,128	$ 1,195
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	302	292	598	569
Unrealized/realized gains on fuel derivative instruments	0	(4)	0	(11)
Deferred income taxes	36	131	50	203
Changes in certain assets and liabilities:
Accounts and other receivables	18	(81)	(204)	(96)
Other assets	86	(35)	115	(213)
Accounts payable and accrued liabilities	(89)	420	(346)	(80)
Air traffic liability	(30)	100	914	966
Other liabilities	(54)	0	(123)	0
Cash collateral received from (provided to) derivative counterparties	(15)	75	0	140
Other, net	(29)	0	(61)	(41)
Net cash provided by operating activities	966	1,631	2,071	2,632
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(230)	(521)	(390)	(929)
Assets constructed for others	0	(17)	0	(41)
Purchases of short-term investments	(550)	(730)	(800)	(930)
Proceeds from sales of short-term and other investments	528	574	1,103	1,134
Net cash used in investing activities	(252)	(694)	(87)	(766)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Employee stock plans	10	9	20	17
Reimbursement for assets constructed for others	0	17	0	157
Payments of long-term debt and finance lease obligations	(75)	(75)	(175)	(157)
Payments of cash dividends	(98)	(93)	(276)	(240)
Repayment of construction obligation	0	(7)	0	(15)
Repurchase of common stock	(450)	(500)	(950)	(1,000)
Other, net	1	4	(11)	(9)
Net cash used in financing activities	(612)	(645)	(1,392)	(1,247)
NET CHANGE IN CASH AND CASH EQUIVALENTS	102	292	592	619
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,344	1,822	1,854	1,495
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,446	2,114	2,446	2,114
CASH PAYMENTS FOR:
Interest, net of amount capitalized	33	34	48	52
Income taxes	314	170	318	174
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS
Flight equipment under finance leases	0	0	0	14
Assets constructed for others	$ 24	$ 40	$ 45	$ 80

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration