Retirement Benefits (Tables) (Unaudited)

6 Months Ended

Jun. 30, 2011

RETIREMENT BENEFITS [Abstract]

Components of net periodic benefit cost

	Three Months Ended June 30												Six Months Ended June 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		$	260		$	266		$	16		$	16
Interest cost		305			304			29			30			610			608			58			60
Expected return on plan assets		(423	)		(380	)		(16	)		(14	)		(846	)		(760	)		(32	)		(28	)
Amortization of:
Prior service cost (credit)		6			9			(13	)		(13	)		12			18			(26	)		(26	)
Net loss from previous years		41			51			3			5			82			102			6			10
Net periodic benefit cost	$	59		$	117		$	11		$	16		$	118		$	234		$	22		$	32
Defined contribution plans cost	$	76		$	86								$	161		$	166