Retirement Benefits (Tables) (Unaudited)

9 Months Ended

Sep. 30, 2011

RETIREMENT BENEFITS [Abstract]

Components of net periodic benefit cost

	Three Months Ended September 30												Nine Months Ended September 30
	Pension						Medical and						Pension						Medical and
	Benefits						Life Benefits						Benefits						Life Benefits
$ in millions	2011			2010			2011			2010			2011			2010			2011			2010
Components of Net Periodic Benefit Cost
Service cost		$ 130			$ 133			$   8			$   8			$    390			$    399			$ 24			$ 24
Interest cost		305			304			29			30			915			912			87			90
Expected return on plan assets		(423	)		(380	)		(16	)		(14	)		(1,269	)		(1,140	)		(48	)		(42	)
Amortization of:
Prior service cost (credit)		6			9			(13	)		(13	)		18			27			(39	)		(39	)
Net loss from previous years		41			51			3			5			123			153			9			15
Net periodic benefit cost		$   59			$ 117			$ 11			$ 16			$    177			$    351			$ 33			$ 48
Defined contribution plans cost		$   64			$   77									$    225			$    243