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Significant Accounting Policies - Impact of the Adoption of the New Lease Standard (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statements of Consolidated Operations                      
Regional capacity purchase                 $ 2,849 $ 2,649 [1] $ 2,268 [1]
Landing fees and other rent                 2,543 2,449 [1] 2,310 [1]
Depreciation and amortization                 2,288 2,165 [1],[2] 2,096 [1],[2]
Interest expense                   (670) (626)
Interest capitalized                 85 65 [1] 74 [1]
Income tax expense                 905 526 [1] 880 [1]
Net income $ 641 $ 1,024 $ 1,052 $ 292 $ 461 $ 833 $ 683 $ 145 $ 3,009 $ 2,122 [1],[2],[3],[4] $ 2,143 [1],[2],[3],[4]
Earnings per share, basic (in dollars per share) $ 2.54 $ 4.01 $ 4.03 $ 1.09 $ 1.70 $ 3.06 $ 2.48 $ 0.51 $ 11.63 $ 7.70 [1] $ 7.08 [1]
Earnings per share, diluted (in dollars per share) $ 2.53 $ 3.99 $ 4.02 $ 1.09 $ 1.69 $ 3.05 $ 2.48 $ 0.51 $ 11.58 $ 7.67 [1] $ 7.06 [1]
Consolidated Balance Sheets                      
Receivables, less allowance for doubtful accounts $ 1,364       $ 1,426 [5]       $ 1,364 $ 1,426 [5]  
Prepaid expenses and other 814       733 [5]       814 733 [5]  
Flight equipment, owned and finance leases         32,599         32,599  
Other property and equipment, owned and finance leases 7,926       6,889 [5]       7,926 6,889 [5]  
Accumulated depreciation and amortization, owned and finance leases         (13,266)         (13,266)  
Operating lease right-of-use assets 4,758       5,262 [5]       4,758 5,262 [5]  
Current maturities of finance leases 46       123 [5]       46 123 [5]  
Current maturities of operating leases 686       719 [5]       686 719 [5]  
Other current liabilities 566       553 [5]       566 553 [5]  
Long-term obligations under finance leases 220       224 [5]       220 224 [5]  
Long-term obligations under operating leases 4,946       5,276 [5]       4,946 5,276 [5]  
Deferred income taxes 1,736       828 [5]       1,736 828 [5]  
Other long-term liabilities 1,024       1,010 [5]       1,024 1,010 [5]  
Retained earnings $ 9,716       6,715 [5]       9,716 6,715 [5]  
Cash Flows from Operating Activities:                      
Net cash provided by operating activities                 6,909 6,164 [2] $ 3,474 [2]
Cash Flows from Investing Activities:                      
Capital expenditures                 (4,528) (4,070) [2] (3,870) [2]
Cash Flows from Financing Activities:                      
Proceeds from issuance of long-term debt                 1,847 1,594 [2] 2,537 [2]
Principal payments under finance leases                 $ (151) (79) [2] (84) [2]
As Reported                      
Statements of Consolidated Operations                      
Regional capacity purchase                   2,601 2,232
Landing fees and other rent                   2,359 2,240
Depreciation and amortization                   2,240 2,149
Interest expense                   (729) (671)
Interest capitalized                   70 84
Income tax expense                   529 896
Net income                   $ 2,129 $ 2,144
Earnings per share, basic (in dollars per share)                   $ 7.73 $ 7.08
Earnings per share, diluted (in dollars per share)                   $ 7.70 $ 7.06
Consolidated Balance Sheets                      
Receivables, less allowance for doubtful accounts         1,346         $ 1,346  
Prepaid expenses and other         913         913  
Flight equipment, owned and finance leases         32,636         32,636  
Other property and equipment, owned and finance leases         7,930         7,930  
Accumulated depreciation and amortization, owned and finance leases         (13,414)         (13,414)  
Operating lease right-of-use assets         0         0  
Current maturities of finance leases         149         149  
Current maturities of operating leases         0         0  
Other current liabilities         619         619  
Long-term obligations under finance leases         1,134         1,134  
Long-term obligations under operating leases         0         0  
Deferred income taxes         814         814  
Other long-term liabilities         1,832         1,832  
Retained earnings         6,668         6,668  
Cash Flows from Operating Activities:                      
Net cash provided by operating activities                   6,181 $ 3,413
Cash Flows from Investing Activities:                      
Capital expenditures                   (4,177) (3,998)
Cash Flows from Financing Activities:                      
Proceeds from issuance of long-term debt                   1,740 2,765
Principal payments under finance leases                   (134) (124)
ASU 2016-02 | New Lease Standard Adjustments                      
Statements of Consolidated Operations                      
Regional capacity purchase                   48 36
Landing fees and other rent                   90 70
Depreciation and amortization                   (75) (53)
Interest expense                   59 45
Interest capitalized                   (5) (10)
Income tax expense                   (3) (16)
Net income                   $ (7) $ (1)
Earnings per share, basic (in dollars per share)                   $ (0.03) $ 0
Earnings per share, diluted (in dollars per share)                   $ (0.03) $ 0
Consolidated Balance Sheets                      
Receivables, less allowance for doubtful accounts         80         $ 80  
Prepaid expenses and other         (180)         (180)  
Flight equipment, owned and finance leases         (37)         (37)  
Other property and equipment, owned and finance leases         (1,041)         (1,041)  
Accumulated depreciation and amortization, owned and finance leases         148         148  
Operating lease right-of-use assets         5,262         5,262  
Current maturities of finance leases         (26)         (26)  
Current maturities of operating leases         719         719  
Other current liabilities         (66)         (66)  
Long-term obligations under finance leases         (910)         (910)  
Long-term obligations under operating leases         5,276         5,276  
Deferred income taxes         14         14  
Other long-term liabilities         (822)         (822)  
Retained earnings         $ 47         47  
Cash Flows from Operating Activities:                      
Net cash provided by operating activities                   (17) $ 61
Cash Flows from Investing Activities:                      
Capital expenditures                   107 128
Cash Flows from Financing Activities:                      
Proceeds from issuance of long-term debt                   (146) (228)
Principal payments under finance leases                   $ 55 $ 40
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[3] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8
[4] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[5] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.