Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Measurements [Abstract]

Schedule Of The Carrying Amount And Estimated Fair Value Of The Company's Financial Instruments That Are Recorded At Fair Value On A Recurring Basis

				Estimated Fair Value Measurements
				Quoted		Significant
				Prices In		Other		Significant
				Active		Observable		Unobservable
	Statement of Financial	Carrying		Markets		Inputs		Inputs
(In millions)	Position Location	Value		(Level 1)		(Level 2)		(Level 3)
As of December 31, 2020:
Financial Assets:
Deferred compensation trust assets	Long-term marketable securities	$	14	$	14	$	—	$	—
Fuel swap contracts	Prepaid expenses and other assets and Other assets		3		—		—		3
Total financial assets		$	18	$	14	$	—	$	3
Financial Liabilities:
Cross-currency interest rate swap	Other long-term obligations	$	15	$	—	$	15	$	—
Net investment hedge	Other long-term obligations		23		—		23		—
Interest rate swap contracts	Accrued liabilities—Other and Other long-term obligations		34		—		34		—
Total financial liabilities		$	72	$	—	$	72	$	—
As of December 31, 2019:
Financial Assets:
Deferred compensation trust assets	Long-term marketable securities	$	13	$	13	$	—	$	—
Fuel swap contracts	Prepaid expenses and other assets and Other assets		1		—		—		1
Interest rate swap contracts	Other assets		5		—		5		—
Total financial assets		$	19	$	13	$	5	$	1
Financial Liabilities:
Interest rate swap contracts	Other accrued liabilities and Other long-term obligations		1		—		1		—
Total financial liabilities		$	1	$	—	$	1	$	—

Schedule Of Reconciliation Of The Beginning And Ending Fair Values Of Financial Instruments Valued Using Significant Unobservable Inputs (Level 3) On A Recurring Basis

	Fuel Swap
	Contract Assets
(In millions)	(Liabilities)		Location of Loss included in Earnings
Balance as of December 31, 2018	$	(4)
Total (losses) gains (realized and unrealized)
Included in earnings		—	Cost of services rendered and products sold
Included in other comprehensive income		5
Settlements		—
Balance as of December 31, 2019	$	1
Total gains (losses) (realized and unrealized)
Included in earnings	$	4	Cost of services rendered and products sold
Included in other comprehensive income		2
Settlements		(4)
Balance as of December 31, 2020	$	3

Schedule Of Level 3 Financial Instruments

	Fair Value		Valuation			Weighted
	(in millions)		Technique	Unobservable Input	Range	Average
As of December 31, 2020:
Fuel swap contracts	$	3	Discounted Cash Flows	Forward Unleaded Price per Gallon(1)	$2.20 - $2.58	$	2.44
As of December 31, 2019:
Fuel swap contracts	$	1	Discounted Cash Flows	Forward Unleaded Price per Gallon(1)	$2.37 - $2.80	$	2.61

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(1)Forward prices per gallon were derived from third-party market data providers. A decrease in the forward price would result in a reduction in the fair value asset of the fuel swap contracts.