Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 820	$ 608	$ 1,333	$ 1,061
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Depreciation and amortization	299	250	588	494
Loss as asset impairment	21	0	21	0
Unrealized/realized (gain) loss on fuel derivative instruments	(122)	74	(34)	85
Deferred income taxes	54	23	80	43
Changes in certain assets and liabilities:
Accounts and other receivables	(14)	41	(35)	(90)
Other assets	(49)	(7)	(45)	6
Accounts payable and accrued liabilities	(288)	(134)	25	43
Air traffic liability	79	201	764	918
Cash collateral received from (provided to) derivative counterparties	347	(377)	116	(394)
Other, net	(35)	(52)	(85)	(87)
Net cash provided by operating activities	1,112	627	2,728	2,079
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(462)	(428)	(900)	(1,001)
Assets constructed for others	(26)	(22)	(37)	(44)
Purchases of short-term investments	(773)	(562)	(1,029)	(877)
Proceeds from sales of short-term and other investments	591	614	1,122	1,223
Payments for (Proceeds from) Other Investing Activities	(4)	(9)	(5)	(9)
Net cash used in investing activities	(674)	(407)	(849)	(708)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from Employee stock plans	6	8	17	21
Proceeds from termination of interest rate derivative instruments	0	0	0	12
Reimbursement for assets constructed for others	25	3	35	5
Payments of long-term debt and capital lease obligations	(48)	(40)	(103)	(92)
Payments of cash dividends	(63)	(50)	(160)	(131)
Repayment of construction obligation	(2)	(3)	(4)	(5)
Repurchase of common stock	(700)	(380)	(1,200)	(680)
Other, net	(4)	(11)	(7)	(11)
Net cash used in financing activities	(786)	(473)	(1,422)	(881)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(348)	(253)	457	490
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	2,388	2,025	1,583	1,282
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,040	1,772	2,040	1,772
CASH PAYMENTS FOR:
Interest, net of amount capitalized	23	21	50	53
Income taxes	565	455	638	566
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS
Flight equipment under capital leases	83	41	251	82
Assets constructed for others	$ 55	$ 37	$ 115	$ 80