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

6 Months Ended

Jun. 30, 2012

Components of Net Periodic Pension and Postretirement Benefit Costs

Company's pension and postretirement benefit plans

($ in millions)		Three months ended June 30,						Six months ended June 30,
		2012			2011			2012			2011
Pension benefits
Service cost	$	38		$	38		$	76		$	76
Interest cost		75			80			149			161
Expected return on plan assets		(99	)		(92	)		(197	)		(184	)
Amortization of:
Prior service credit		(1	)		(1	)		(1	)		(1	)
Net actuarial loss		45			39			89			77
Settlement loss		9			8			19			17
Net periodic pension cost	$	67		$	72		$	135		$	146
Postretirement benefits
Service cost	$	3		$	3		$	6		$	6
Interest cost		9			9			18			18
Amortization of:
Prior service credit		(5	)		(5	)		(11	)		(11	)
Net actuarial gain		(5	)		(8	)		(10	)		(15	)
Net periodic postretirement benefit cost (credit)	$	2		$	(1	)	$	3		$	(2	)