Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Periodic benefit cost related to our defined benefit plans, net

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions) for the three and six months ended June 30,2012 and 2011:

	Pension Plans						Other Postretirement Benefit Plans
	2012			2011			2012			2011
Three months ended June 30:
Service cost	$	35		$	22		$	3		$	2
Interest cost	23			22			6			5
Expected return on plan assets	(31		)	(28		)	—			—
Amortization of:
Prior service credit	—			—			(6		)	(5		)
Net actuarial loss	9			3			—			1
Net periodic benefit cost	$	36		$	19		$	3		$	3
Six months ended June 30:
Service cost	$	70		$	45		$	6		$	5
Interest cost	46			43			11			11
Expected return on plan assets	(62		)	(56		)	—			—
Amortization of:
Prior service cost (credit)	1			1			(11		)	(11		)
Net actuarial loss	17			6			—			1
Net periodic benefit cost	$	72		$	39		$	6		$	6