Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2012

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Components Of Accumulated Other Comprehensive Income (Loss)

The components of Accumulated other comprehensive income (loss) are as follows (in millions):

	Pension and Retiree Medical Liability			Unrealized Gain/(Loss) on Investments			Derivative Financial Instruments			Income Tax Benefit/ (Expense)			Total
Balance at December 31, 2011	$	(3,887	)	$	(4	)	$	30		$	(103	)	$	(3,964	)
Current year change	(1,910		)	3									(1,907		)
Amortization of actuarial loss and prior service cost	130			—			—			—			130
Benefit plan modifications	3,345			—			—			—			3,345
Reclassification of derivative financial instruments into earnings	—			—			(3		)	—			(3		)
Change in fair value of derivative financial instruments	—			—			(12		)	—			(12		)
Non-cash tax provision	—			—			—			(569		)	(569		)
Balance at December 31, 2012	$	(2,322	)	$	(1	)	$	15		$	(672	)	$	(2,980	)