Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Employee Benefit Plans [Abstract]

Components of net periodic benefit costs

	Pension Benefits												Other Postretirement Benefits
	Three Months						Nine Months						Three Months						Nine Months
	Ended						Ended						Ended						Ended
	September 30,						September 30,						September 30,						September 30,
	2011			2010			2011			2010			2011			2010			2011			2010
	(In millions)
Service costs	$	64		$	45		$	190		$	133		$	4		$	4		$	13		$	13
Interest costs		104			99			314			298			27			28			81			84
Expected return on plan assets		(112	)		(113	)		(339	)		(337	)		(19	)		(19	)		(58	)		(59	)
Settlement and curtailment costs		—			1			—			8			—			—			—			—
Amortization of net actuarial (gains) losses		49			49			146			147			11			9			32			28
Amortization of prior service costs (credit)		1			2			3			5			(27	)		(21	)		(81	)		(62	)
Net periodic benefit costs	$	106		$	83		$	314		$	254		$	(4	)	$	1		$	(13	)	$	4

Net periodic benefit cost amortized from accumulated other comprehensive income (loss)

	Pension Benefits												Other Postretirement Benefits
	Three Months						Nine Months						Three Months						Nine Months
	Ended						Ended						Ended						Ended
	September 30,						September 30,						September 30,						September 30,
	2011			2010			2011			2010			2011			2010			2011			2010
	(In millions)
Amortization of net actuarial (gains) losses	$	49		$	49		$	146		$	147		$	11		$	9		$	32		$	28
Amortization of prior service costs (credit)		1			2			3			5			(27	)		(21	)		(81	)		(62	)
Subtotal		50			51			149			152			(16	)		(12	)		(49	)		(34	)
Deferred income tax expense (benefit)		(18	)		(17	)		(52	)		(53	)		6			3			17			29
Components of net periodic benefit costs amortized from accumulated other comprehensive income (loss), net of income tax	$	32		$	34		$	97		$	99		$	(10	)	$	(9	)	$	(32	)	$	(5	)