Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic (benefit) cost for defined benefit pension plans are summarized in the following table:

		Three Months Ended June 30,				Six Months Ended June 30,
(Dollars in millions)	Income Statement Location	2022		2021		2022		2021
Service cost	Personnel expense	$	140	$	157	$	279	$	315
Interest cost	Other expense	88		80		176		159
Estimated return on plan assets	Other expense	(270)		(249)		(539)		(498)
Amortization and other	Other expense	9		9		17		17
Net periodic (benefit) cost		$	(33)	$	(3)	$	(67)	$	(7)