Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2019

Comprehensive Income (Loss) [Abstract]

Summary Of The Activity In Other Comprehensive Income (Loss), Net Of The Related Tax Effects

				Unrealized
				Gains on		Foreign
		Unrealized		Available		Currency
	Gains (Losses) on			-for-Sale		Translation
(In millions)		Derivatives		Securities		(Loss) Gain		Total
Balance as of December 31, 2017		$	16	$	2	$	(12)	$	5
Reclassification of unrealized gain/loss on equity securities			—		(2)		—		(2)
Reclassification of tax rate change			3		1		—		4
As revised, January 1, 2018		$	19	$	—	$	(12)	$	7
Other comprehensive income before reclassifications:
Pre-tax amount			4		—		(3)		1
Tax provision			1		—		—		1
After-tax amount			3		—		(3)		—
Amounts reclassified from accumulated Other Comprehensive Income (Loss)(1)			(3)		—		—		(3)
Net current period other comprehensive loss			1		—		(3)		(3)
Balance as of December 31, 2018		$	20	$	—	$	(15)	$	5
Other comprehensive income before reclassifications:
Pre-tax amount			(7)		—		10		3
Tax provision			5		—		—		5
After-tax amount			(2)		—		10		8
Amounts reclassified from accumulated Other Comprehensive Income (Loss)(1)			(4)		—		—		(4)
Net current period other comprehensive income			(6)		—		10		4
Balance as of December 31, 2019		$	13	$	—	$	(5)	$	9

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(1)Amounts are net of tax. See reclassifications out of accumulated other comprehensive income below for further details.

Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)

	Amounts Reclassified from Accumulated
	Other Comprehensive Income
	As of December 31,
(In millions)	2019		2018		2017
Gains (losses) on derivatives:
Fuel swap contracts	$	—	$	3	$	3
Interest rate swap contracts		5		1		(8)
Net losses on derivatives		5		4		(6)
Impact of income taxes		—		(1)		2
Total reclassifications for the period	$	4	$	3	$	(4)