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Benefit Plans (Net Pension Liability Recognized in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Accrued pension costs	$ (1,012)	$ (212)
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	173
Other accrued liabilities	(21)	(21)
Accrued pension costs	(1,012)	(212)
Net pension liability recognized at December 31	$ (1,033)	$ (60)

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.