Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2020

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost (credit)

Components of net periodic benefit cost (credit) consist of the following (dollars in millions):

	Pension Plans						Post-retirement Benefits
	For the Three Months Ended June 30,						For the Three Months Ended June 30,
	2020			2019			2020			2019
Net periodic benefit cost:
Service cost	$	3		$	3		$	—		$	1
Interest cost		1			2			—			1
Expected return on assets		(2	)		(3	)		—			—
Prior service credit		—			—			(3	)		(4	)
Net periodic benefit cost (credit)	$	2		$	2		$	(3	)	$	(2	)

	Pension Plans						Post-retirement Benefits
	For the Six Months Ended June 30,						For the Six Months Ended June 30,
	2020			2019			2020			2019
Net periodic benefit cost:
Service cost	$	5		$	5		$	—		$	1
Interest cost		3			4			1			2
Expected return on assets		(4	)		(5	)		—			—
Prior service credit		—			—			(6	)		(7	)
Net periodic benefit cost (credit)	$	4		$	4		$	(5	)	$	(4	)