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Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred taxes on unrealized gain (loss), other, tax effect	$ (2)	$ 5	$ 5
Deferred taxes on postretirement	15	2	(13)
Fuel derivatives
Deferred taxes on unrealized gain (loss) on derivatives, tax effect	(7)	185	432
Interest rate derivatives
Deferred taxes on unrealized gain (loss) on derivatives, tax effect	$ 1	$ 4	$ 5

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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