Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2015

Retirement Plans [Abstract]

Net Periodic Benefit Cost

	Pension Benefits
	For the three months ended
	March 31,
	2015		2014
($ in millions)
Components of net periodic pension benefit cost
Service cost	$	13	$	10
Interest cost on projected benefit obligation		22		20
Expected return on plan assets		(32)		(24)
Amortization of unrecognized loss		7		5
Net periodic pension benefit cost	$	10	$	11

	Postretirement Benefits
	Other Than Pensions (OPEB)
	For the three months ended
	March 31,
	2015		2014
($ in millions)
Components of net periodic postretirement benefit cost
Service cost	$	5	$	3
Interest cost on projected benefit obligation		7		5
Expected return on plan assets		-		(1)
Amortization of prior service cost/(credit)		(1)		(1)
Amortization of unrecognized loss		3		1
Net periodic postretirement benefit cost	$	14	$	7