Components of Net Periodic Pension and Postretirement Benefit Costs (Tables)

3 Months Ended

Mar. 31, 2013

Components of Net Periodic Pension and Postretirement Benefit Costs

Company's pension and postretirement benefit plans

($ in millions)		2013		2012
Pension benefits
Service cost	$	40	$	38
Interest cost		66		74
Expected return on plan assets		(97)		(98)
Amortization of:
Net actuarial loss		65		44
Settlement loss		10		10
Net periodic pension cost	$	84	$	68
Postretirement benefits
Service cost	$	4	$	3
Interest cost		8		9
Amortization of:
Prior service credit		(6)		(6)
Net actuarial gain		(3)		(5)
Net periodic postretirement cost	$	3	$	1