Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Benefit Plans

Company's pension and postretirement benefit plans

($ in millions)		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
Pension benefits
Service cost	$	32		$	38		$	111		$	114
Interest cost		66			74			198			223
Expected return on plan assets		(100	)		(98	)		(293	)		(295	)
Amortization of:
Prior service credit		(12	)		(1	)		(13	)		(2	)
Net actuarial loss		54			45			184			134
Settlement loss		85			10			104			29
Net periodic pension cost	$	125		$	68		$	291		$	203
Postretirement benefits
Service cost	$	3		$	3		$	10		$	9
Interest cost		6			9			23			27
Amortization of:
Prior service credit		(5	)		(6	)		(17	)		(17	)
Net actuarial gain		(5	)		(5	)		(11	)		(15	)
Curtailment gain		(181	)		--			(181	)		--
Net periodic postretirement (credit) cost	$	(182	)	$	1		$	(176	)	$	4