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Consolidated Statements of Cash Flows $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 569 | $ 189 | $ 1,140
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred income taxes | 139 | 90 | (309)
Depreciation | 474 | 423 | 383
Impairment of Long-Lived Assets Held-for-use | 0 | 319 | 0
Amortization | 51 | 46 | 41
Stock-based compensation | 31 | 28 | 29
Changes in certain operating assets and liabilities: |  |  |
(Increase) decrease in receivables | (3) | 46 | (52)
(Increase) decrease in inventories, prepaid and other | 188 | (178) | 21
Increase in air traffic liability | 118 | 131 | 101
Increase (decrease) in accounts payable and other accrued liabilities | (91) | 103 | 47
Other, net | (27) | 3 | (22)
Net cash provided by operating activities | 1,449 | 1,200 | 1,379
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures | (932) | (908) | (1,074)
Predelivery deposits for flight equipment | (224) | (206) | (128)
Purchase of held-to-maturity investments | (374) | (429) | (207)
Proceeds from the maturities of held-to-maturity investments | 534 | 505 | 244
Purchase of available-for-sale securities | (1,000) | (979) | (245)
Proceeds from the sale of available-for-sale securities | 880 | 875 | 444
Other, net | (13) | (15) | (13)
Net cash used in investing activities | (1,129) | (1,157) | (979)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from issuance of common stock | 51 | 48 | 48
Issuance of long-term debt | 981 | 687 | 0
Repayment of long-term debt and finance lease obligations | (323) | (222) | (194)
Acquisition of treasury stock | (542) | (382) | (390)
Other, net | (2) | 0 | 0
Net cash provided by (used in) financing activities | 165 | 131 | (536)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect | 485 | 174 | (136)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 1,018 | 533 | 359
Cash and cash equivalents at end of period | 959 | 474 | 303
Restricted cash | 59 | 59 | 56
Supplemental Cash Flow Information [Abstract] |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities | 62 | 59 | 60
Income Taxes Paid, Net | (52) | 11 | 139
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 7 | $ 20 | $ 51

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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