Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Employee Benefit Plans (Tables) [Abstract]

Components of net periodic benefit cost

	Pension Benefits												Other Postretirement Benefits
	Three Months						Six Months						Three Months						Six Months
	Ended						Ended						Ended						Ended
	June 30,						June 30,						June 30,						June 30,
	2011			2010			2011			2010			2011			2010			2011			2010
										(In millions)
Service costs	$	63		$	44		$	126		$	88		$	4		$	5		$	9		$	9
Interest costs		105			100			210			199			27			28			54			56
Expected return on plan assets		(113	)		(112	)		(227	)		(224	)		(19	)		(21	)		(39	)		(40	)
Settlement and curtailment costs		—			7			—			7			—			—			—			—
Amortization of net actuarial (gains) losses		48			49			97			98			10			10			21			19
Amortization of prior service costs (credit)		1			1			2			3			(27	)		(20	)		(54	)		(41	)
Net periodic benefit costs	$	104		$	89		$	208		$	171		$	(5	)	$	2		$	(9	)	$	3

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

	Pension Benefits												Other Postretirement Benefits
	Three Months						Six Months						Three Months						Six Months
	Ended						Ended						Ended						Ended
	June 30,						June 30,						June 30,						June 30,
	2011			2010			2011			2010			2011			2010			2011			2010
	(In millions)
Amortization of net actuarial (gains) losses	$	48		$	49		$	97		$	98		$	10		$	10		$	21		$	19
Amortization of prior service costs (credit)		1			1			2			3			(27	)		(20	)		(54	)		(41	)
Subtotal		49			50			99			101			(17	)		(10	)		(33	)		(22	)
Deferred income tax expense (benefit)		(15	)		(18	)		(34	)		(36	)		7			28			11			26
Components of net periodic benefit costs amortized from accumulated other comprehensive income (loss), net of income tax	$	34		$	32		$	65		$	65		$	(10	)	$	18		$	(22	)	$	4