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New Accounting Pronouncements - Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued Liabilities, Current | $ 1,361 |  | $ 1,361 |  | $ 1,700
Air traffic liability | 4,652 |  | 4,652 |  | 3,495
Air traffic liability - noncurrent | 878 |  | 878 |  | 1,070
Deferred income taxes | 2,414 |  | 2,414 |  | 2,119
Retained earnings | 14,878 |  | 14,878 |  | 13,832
Passenger Revenue | 5,358 | $ 5,379 | 9,943 | $ 9,925 |
Other Revenue, Net | 340 | 308 | 656 | 574 |
Salaries, wages, and benefits | 1,927 | 1,863 | 3,748 | 3,594 |
Fuel and oil | 1,202 | 1,024 | 2,220 | 1,979 |
Other operating expenses | 731 | 727 | 1,355 | 1,414 |
Other (gains) losses, net | (4) | (44) | (8) | (106) |
PROVISION FOR INCOME TAXES | 227 | 422 | 366 | 616 |
Net income | 733 | 743 | 1,195 | 1,082 |
Deferred income taxes | $ 131 | $ 68 | $ 203 | $ 121 |
NET INCOME PER SHARE, BASIC | $ 1.27 | $ 1.23 | $ 2.05 | $ 1.78 |
NET INCOME PER SHARE, DILUTED | $ 1.27 | $ 1.23 | $ 2.05 | $ 1.77 |
Changes in certain assets and liabilities |  | $ (440) |  | $ 454 |
Net Cash Provided by operating activities | $ 1,631 | 746 | $ 2,632 | 2,370 |
Scenario, Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued Liabilities |  |  |  |  | 1,777
Air traffic liability |  |  |  |  | 3,460
Air traffic liability - noncurrent |  |  |  |  | 0
Deferred income taxes |  |  |  |  | 2,358
Retained earnings |  |  |  |  | 14,621
Passenger Revenue |  | 5,233 |  | 9,658 |
Other Revenue, Net |  | 467 |  | 883 |
Salaries, wages, and benefits |  | 1,867 |  | 3,600 |
Fuel and oil |  | 990 |  | 1,912 |
Other operating expenses |  | 735 |  | 1,431 |
Other (gains) losses, net |  | 74 |  | 167 |
PROVISION FOR INCOME TAXES |  | 424 |  | 626 |
Net income |  | 746 |  | 1,097 |
Deferred income taxes |  | $ 69 |  | $ 131 |
NET INCOME PER SHARE, BASIC |  | $ 1.24 |  | $ 1.80 |
NET INCOME PER SHARE, DILUTED |  | $ 1.23 |  | $ 1.80 |
Changes in certain assets and liabilities |  | $ (444) |  | $ 429 |
Net Cash Provided by operating activities |  | 746 |  | 2,370 |
Adjustments for New Accounting Principle, ASU 2017-12 | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Passenger Revenue |  | 0 |  | 0 |
Other Revenue, Net |  | 0 |  | 0 |
Salaries, wages, and benefits |  | 0 |  | 0 |
Fuel and oil |  | 34 |  | 67 |
Other operating expenses |  | 0 |  | 0 |
Other (gains) losses, net |  | (34) |  | (67) |
PROVISION FOR INCOME TAXES |  | 0 |  | 0 |
Net income |  | $ 0 |  | $ 0 |
NET INCOME PER SHARE, BASIC |  | $ 0 |  | $ 0 |
NET INCOME PER SHARE, DILUTED |  | $ 0 |  | $ 0 |
ASU 2014-09 | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued Liabilities |  |  |  |  | (77)
Air traffic liability |  |  |  |  | 35
Air traffic liability - noncurrent |  |  |  |  | 1,070
Deferred income taxes |  |  |  |  | (239)
Retained earnings |  |  |  |  | $ (789)
Passenger Revenue |  | $ 146 |  | $ 267 |
Other Revenue, Net |  | (159) |  | (309) |
Salaries, wages, and benefits |  | 0 |  | 0 |
Fuel and oil |  | 0 |  | 0 |
Other operating expenses |  | (8) |  | (17) |
Other (gains) losses, net |  | 0 |  | 0 |
PROVISION FOR INCOME TAXES |  | (2) |  | (10) |
Net income |  | (3) |  | (15) |
Deferred income taxes |  | $ (1) |  | $ (10) |
NET INCOME PER SHARE, BASIC |  | $ (0.01) |  | $ (0.02) |
NET INCOME PER SHARE, DILUTED |  | $ 0 |  | $ (0.03) |
Changes in certain assets and liabilities |  | $ 4 |  | $ 25 |
Net Cash Provided by operating activities |  | 0 |  | 0 |
Adjustments for New Accounting Pronouncement, 2017-07 | Restatement Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Passenger Revenue |  | 0 |  | 0 |
Other Revenue, Net |  | 0 |  | 0 |
Salaries, wages, and benefits |  | (4) |  | (6) |
Fuel and oil |  | 0 |  | 0 |
Other operating expenses |  | 0 |  | 0 |
Other (gains) losses, net |  | 4 |  | 6 |
PROVISION FOR INCOME TAXES |  | 0 |  | 0 |
Net income |  | $ 0 |  | $ 0 |
NET INCOME PER SHARE, BASIC |  | $ 0 |  | $ 0 |
NET INCOME PER SHARE, DILUTED |  | $ 0 |  | $ 0 |

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