Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2020

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	2020		2019		2020		2019
Service cost	Personnel expense	$	118	$	55	$	236	$	109
Interest cost	Other expense	78		54		156		111
Estimated return on plan assets	Other expense	(217)		(114)		(433)		(227)
Amortization and other	Other expense	19		26		38		51
Net periodic (benefit) cost		$	(2)	$	21	$	(3)	$	44