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

9 Months Ended

Sep. 30, 2011

Components of Net Periodic Pension and Postretirement Benefit Costs

Company's pension and postretirement benefit plans

($ in millions)		Three months ended September 30,						Nine months ended September 30,
		2011			2010			2011			2010
Pension benefits
Service cost	$	37		$	38		$	113		$	113
Interest cost		81			80			242			240
Expected return on plan assets		(92	)		(83	)		(276	)		(248	)
Amortization of:
Prior service credit		--			(1	)		(1	)		(2	)
Net actuarial loss		39			40			116			119
Settlement loss		9			13			26			39
Net periodic pension cost	$	74		$	87		$	220		$	261
Postretirement benefits
Service cost	$	2		$	3		$	8		$	9
Interest cost		9			10			27			30
Amortization of:
Prior service credit		(6	)		(6	)		(17	)		(17	)
Net actuarial gain		(7	)		(5	)		(22	)		(16	)
Settlement loss		1			--			1			--
Net periodic postretirement benefit cost	$	(1	)	$	2		$	(3	)	$	6