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New Accounting Pronouncements - Adjustments (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2018 USD ($) aircraft $ / shares | Sep. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) aircraft $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) aircraft $ / shares | Dec. 31, 2017 USD ($) aircraft $ / shares | Dec. 31, 2016 USD ($) $ / shares | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  | $ 310 |  |  |  | $ 460 |  |  |  |  | $ 310 | $ 460 |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 21,965 | 21,146 | $ 20,289 |  |
Accrued Liabilities, Recast |  | 1,749 |  |  |  | 1,700 |  |  |  |  | 1,749 | 1,700 |  |  |
Air traffic liability |  | 4,134 |  |  |  | 3,495 |  |  |  |  | 4,134 | 3,495 |  |  |
Air traffic liablity - noncurrent |  | 936 |  |  |  | 1,070 |  |  |  |  | 936 | 1,070 |  |  |
Deferred income taxes |  | 2,427 |  |  |  | 2,119 |  |  |  |  | 2,427 | 2,119 |  |  |
Retained earnings |  | $ 15,967 |  |  |  | $ 13,832 |  |  |  |  | $ 15,967 | $ 13,832 |  |  |
Aircraft under operating lease | aircraft |  | 51 |  |  |  | 53 |  |  |  |  | 51 | 53 |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  |  | $ 7,649 | $ 7,305 | 6,786 |  |
Fuel and oil |  |  |  |  |  |  |  |  |  |  | 4,616 | 4,076 | 3,801 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  | 2,852 | 2,847 | 2,703 |  |
Other (gains) losses, net |  |  |  |  |  |  |  |  |  |  | 18 | 112 | 21 |  |
PROVISION (BENEFIT) FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  | 699 | (92) | 1,267 |  |
Net income |  | $ 654 | $ 615 | $ 733 | $ 463 | $ 1,747 | [1] | $ 528 | $ 743 | $ 339 | $ 2,465 | $ 3,357 | $ 2,183 |  |
NET INCOME PER SHARE, BASIC (in dollars per share) | $ / shares |  | $ 1.17 | $ 1.08 | $ 1.27 | $ 0.79 | $ 2.95 | [1] | $ 0.88 | $ 1.23 | $ 0.55 | $ 4.30 | $ 5.58 | $ 3.48 |  |
NET INCOME PER SHARE, DILUTED (in dollars per share) | $ / shares |  | $ 1.17 | $ 1.08 | $ 1.27 | $ 0.79 | $ 2.94 | [1] | $ 0.88 | $ 1.23 | $ 0.55 | $ 4.29 | $ 5.57 | $ 3.45 |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  | $ 301 | $ (1,066) | $ 419 |  |
Changes in certain assets and liabilities |  |  |  |  |  |  |  |  |  |  |  | 212 | 279 |  |
Net Cash Provided by operating activities |  |  |  |  |  |  |  |  |  |  | 4,893 | 3,929 | 4,293 |  |
Flight equipment |  | $ 21,753 |  |  |  | $ 21,368 |  |  |  |  | 21,753 | 21,368 |  |  |
Assets constructed for others |  | 1,768 |  |  |  | 1,543 |  |  |  |  | 1,768 | 1,543 |  |  |
Less allowance for depreciation and amortization |  | 9,731 |  |  |  | 9,690 |  |  |  |  | 9,731 | 9,690 |  |  |
Other assets |  | 720 |  |  |  | 786 |  |  |  |  | 720 | 786 |  |  |
Assets |  | 26,243 |  |  |  | 25,110 |  |  |  |  | 26,243 | 25,110 |  |  |
Accounts payable |  | 1,416 |  |  |  | 1,320 |  |  |  |  | 1,416 | 1,320 |  |  |
Current maturities of long-term debt |  | 606 |  |  |  | 348 |  |  |  |  | 606 | 348 |  |  |
Construction obligation | [2] | 1,701 |  |  |  | 1,390 |  |  |  |  | 1,701 | 1,390 |  |  |
Other noncurrent liabilities |  | 650 |  |  |  | 707 |  |  |  |  | 650 | 707 |  |  |
Liabilities and Equity |  | $ 26,243 |  |  |  | 25,110 |  |  |  |  | $ 26,243 | 25,110 |  |  |
Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Liabilities |  |  |  |  |  | 1,777 |  |  |  |  |  | 1,777 |  |  |
Air traffic liability |  |  |  |  |  | 3,460 |  |  |  |  |  | 3,460 |  |  |
Air traffic liablity - noncurrent |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Deferred income taxes |  |  |  |  |  | 2,358 |  |  |  |  |  | 2,358 |  |  |
Retained earnings |  |  |  |  |  | 14,621 |  |  |  |  |  | 14,621 |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  |  |  | 7,319 | 6,798 |  |
Fuel and oil |  |  |  |  |  |  |  |  |  |  |  | 3,940 | 3,647 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | 2,886 | 2,743 |  |
Other (gains) losses, net |  |  |  |  |  |  |  |  |  |  |  | (234) | (162) |  |
PROVISION (BENEFIT) FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | (237) | 1,303 |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | $ 3,488 | $ 2,244 |  |
NET INCOME PER SHARE, BASIC (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 5.80 | $ 3.58 |  |
NET INCOME PER SHARE, DILUTED (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 5.79 | $ 3.55 |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | $ 1,212 | $ (455) |  |
Changes in certain assets and liabilities |  |  |  |  |  |  |  |  |  |  |  | 227 | 182 |  |
Net Cash Provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | 3,929 | 4,293 |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets constructed for others |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption |  |  |  |  |  |  |  |  |  |  |  | 14 | 12 |  |
Adjustments for New Accounting Standards Update 2014-09 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Liabilities |  |  |  |  |  | (77) |  |  |  |  |  | (77) |  |  |
Air traffic liability |  |  |  |  |  | 35 |  |  |  |  |  | 35 |  |  |
Air traffic liablity - noncurrent |  |  |  |  |  | 1,070 |  |  |  |  |  | 1,070 |  |  |
Deferred income taxes |  |  |  |  |  | (239) |  |  |  |  |  | (239) |  |  |
Retained earnings |  |  |  |  |  | $ (789) |  |  |  |  |  | (789) |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Fuel and oil |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | (39) | (40) |  |
Other (gains) losses, net |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
PROVISION (BENEFIT) FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | 145 | (36) |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | $ (131) | $ (60) |  |
NET INCOME PER SHARE, BASIC (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ (0.22) | $ (0.1) |  |
NET INCOME PER SHARE, DILUTED (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ (0.22) | $ (0.1) |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | $ (145) | $ 36 |  |
Changes in certain assets and liabilities |  |  |  |  |  |  |  |  |  |  |  | (14) | 96 |  |
Net Cash Provided by operating activities |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Adjustments for New Accounting Standards Update 2017-07 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  |  |  | (14) | (12) |  |
Fuel and oil |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other (gains) losses, net |  |  |  |  |  |  |  |  |  |  |  | (14) | (12) |  |
PROVISION (BENEFIT) FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
NET INCOME PER SHARE, BASIC (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
NET INCOME PER SHARE, DILUTED (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Adjustments for New Accounting Standards Update 2017-12 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Fuel and oil |  |  |  |  |  |  |  |  |  |  |  | 136 | 154 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other (gains) losses, net |  |  |  |  |  |  |  |  |  |  |  | 136 | 154 |  |
PROVISION (BENEFIT) FOR INCOME TAXES |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
NET INCOME PER SHARE, BASIC (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
NET INCOME PER SHARE, DILUTED (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
Accumulated other comprehensive income (loss) | Adjustments for New Accounting Standards Update 2014-09 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20
B-717-200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aircraft under operating lease | aircraft |  | 73 |  |  |  |  |  |  |  |  | 73 |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | $ 20,455 | $ 19,763 | $ 19,068 |  |
Passenger | Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 19,141 | 18,594 |  |
Passenger | Adjustments for New Accounting Standards Update 2014-09 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 622 | 474 |  |
Passenger | Adjustments for New Accounting Standards Update 2017-07 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Passenger | Adjustments for New Accounting Standards Update 2017-12 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | $ 1,335 | 1,210 | 1,050 |  |
Other | Scenario, Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 1,857 | 1,660 |  |
Other | Adjustments for New Accounting Standards Update 2014-09 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | (647) | (610) |  |
Other | Adjustments for New Accounting Standards Update 2017-07 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Other | Adjustments for New Accounting Standards Update 2017-12 | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |
[1] | Includes a $1.3 billion reduction in Provision for income taxes related to the Tax Cuts and Jobs Act legislation enacted in December 2017, which resulted in a re-measurement of the Company's deferred tax assets and liabilities at the new federal corporate tax rate of 21 percent. See Note 14 to the Consolidated Financial Statements for further information.
[2] | Construction obligation will be reduced through future facility rent payments. These future payments are not fixed per the lease agreement, but are variable and fluctuate based on various market and other factors outside the control of the Company.

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