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Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred taxes on unrealized gain (loss), other, tax effect | $ 8 | $ (2) | $ 5
Deferred taxes on postretirement | (9) | 15 | 2
Fuel derivatives |  |  |
Deferred taxes on unrealized gain (loss) on derivatives, tax effect | (16) | (7) | 185
Interest rate derivatives |  |  |
Deferred taxes on unrealized gain (loss) on derivatives, tax effect | $ (8) | $ 1 | $ 4

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