Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Components Of Net Periodic Benefit Cost

The following tables provide the components of net periodic benefit cost for the three months and six months ended June 30, 2013 and 2012 (in millions):

	Pension Benefits
	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Components of net periodic benefit cost
Service cost	$	1		$	104		$	2		$	208
Interest cost	163			191			326			382
Expected return on assets	(180		)	(166		)	(360		)	(332		)
Amortization of:
Prior service cost	7			3			14			7
Unrecognized net (gain) loss	23			63			46			124
Net periodic benefit cost	$	14		$	195		$	28		$	389

	Retiree Medical and Other Benefits
	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Components of net periodic benefit cost
Service cost	$	—		$	15		$	—		$	30
Interest cost	13			38			26			76
Expected return on assets	(4		)	(4		)	(8		)	(8		)
Amortization of:
Prior service cost	(61		)	(7		)	(122		)	(14		)
Unrecognized net (gain) loss	(2		)	(2		)	(4		)	(4		)
Net periodic benefit cost	$	(54	)	$	40		$	(108	)	$	80