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Consolidated Statement of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred taxes on postretirement | $ 25 | $ (15) | $ (9)
Deferred taxes on unrealized gain (loss), other, tax effect | (13) | 7 | 8
Fuel derivative contracts |  |  |
Deferred taxes on unrealized gain (loss) on derivatives, tax effect | 142 | 2 | (16)
Interest rate derivatives |  |  |
Deferred taxes on unrealized gain (loss) on derivatives, tax effect | $ 2 | $ (8) | $ (8)

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