Financial data relative to qualified and nonqualified defined benefit pension plans is summarized in the following tables for the years indicated. On the Consolidated Balance Sheets, the qualified pension plan prepaid asset is recorded as a component of other assets and the nonqualified pension plans accrued liability is recorded as a component of other liabilities. The data is calculated using an actuarial measurement date of December 31.



	Year Ended December 31,
(Dollars in millions)	2017			2016			2015
Net Periodic Pension Cost:
Service cost	$	200		$	186		$	176
Interest cost	192			181			157
Estimated return on plan assets	(372		)	(326		)	(327		)
Net amortization and other	75			80			67
Net periodic benefit cost	95			121			73
Pre-Tax Amounts Recognized in OCI:
Prior service credit (cost)	30			—			—
Net actuarial loss (gain)	137			138			230
Net amortization	(75		)	(80		)	(67		)
Net amount recognized in OCI	92			58			163
Total net periodic pension costs (income) recognized in total comprehensive income, pre-tax	$	187		$	179		$	236

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