Benefit Plans (Net Pension Liability Recognized in Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accrued pension costs	$ (212)	$ (1,735)
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	173	0
Other accrued liabilities	(21)	(22)
Accrued pension costs	(212)	(1,735)
Net pension liability recognized at December 31	$ (60)	$ (1,757)