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AOCI - Differences between Net Income and Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Statement of Income Captions [Line Items] |  |  |  |
NET INCOME | $ 615 | $ 528 | $ 1,811 | $ 1,610
Other, net of deferred taxes | 6 | 2 | 9 | 4
Total other comprehensive income | 114 | 127 | 418 | 187
COMPREHENSIVE INCOME | 729 | 655 | 2,229 | 1,797
Other deferred taxes | 1 | 2 | 1 | 2
Fuel derivatives |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Unrealized gain (loss) on derivative instruments, net of deferred taxes | 107 | 123 | 404 | 178
Derivative deferred taxes | 32 | 73 | 123 | 105
Interest rate derivatives |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Unrealized gain (loss) on derivative instruments, net of deferred taxes | 1 | 2 | 5 | 5
Derivative deferred taxes | $ 0 | $ 0 | $ 1 | $ 2

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