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AOCI - Differences between Net Income and Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
NET INCOME | $ 659 |  |  | $ 615 |  |  | $ 1,787 | $ 1,811
Other, net of deferred taxes | 2 |  |  | 6 |  |  | 18 | 9
Total other comprehensive income (loss) | (93) |  |  | 114 |  |  | (83) | 418
Comprehensive income | 566 | $ 675 | $ 463 | 729 | $ 953 | $ 547 | 1,704 | 2,229
Other deferred taxes | 0 |  |  | 1 |  |  | 5 | 1
Fuel derivatives |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivative instruments, net of deferred taxes | (80) |  |  | 107 |  |  | (61) | 404
Derivative deferred taxes | (24) |  |  | 32 |  |  | (18) | 123
Interest rate derivatives |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Unrealized gain (loss) on derivative instruments, net of deferred taxes | (15) |  |  | 1 |  |  | (40) | 5
Derivative deferred taxes | $ (5) |  |  | $ 0 |  |  | $ (13) | $ 1

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