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Employee Bargaining Agreements and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Change in Benefit Obligation, Plan Assets and Funded Status of Defined Benefit Pension Plans

The change in benefit obligation, plan assets and the funded status of the defined benefit pension plans in the United Kingdom using a measurement date of December 31, 2018 and 2017, are as follows (in millions):

	Pension Benefits
At year end	2018			2017
Benefit obligation at beginning of year	$	13		$	13
Interest cost		—			—
Actuarial loss (gain)		1			1
Benefits paid		—			—
Plan settlements		(3	)		—
Foreign currency exchange rate changes		—			(1	)
Benefit obligation at end of year		11			13

Fair value of plan assets at beginning of year	$	18		$	15
Actual return		—			2
Benefits paid		—			—
Company contributions		—			1
Plan settlements		(3	)		—
Foreign currency exchange rate changes		—			—
Fair value of plan assets at end of year		15			18

Funded status		4			5
Accumulated benefit obligation at end of year		11			13

Assumption Rates Used for Benefit Obligations

The assumption rates used for benefit obligations are as follows:

	December 31,
	2018	2017
Discount rate:	2.65% - 2.90%	2.50%

Assumption Rates Used for Net Periodic Benefit Costs

The assumption rates used for net periodic benefit costs are as follows:

	December 31,
	2018	2017	2016
Discount rate:	2.50%	2.70%	3.70%
Expected return on assets:	3.10% - 4.17%	3.27% - 4.27%	4.04% - 4.50%

Plan's Assets Carried at Fair Value

The following table sets forth by level, within the fair value hierarchy, the plan’s assets carried at fair value (in millions):

	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
December 31, 2018:
Equity securities	$	5	$	5	$	—	$	—
Fixed income securities		5		5		—		—
Other		5		—		5		—
Total fair value measurements	$	15	$	10	$	5	$	—

December 31, 2017:
Equity securities	$	10	$	10	$	—	$	—
Fixed income securities		3		3		—		—
Other		5		—		5		—
Total fair value measurements	$	18	$	13	$	5	$	—