Benefit Plans (Pension Liabilities Recognized in Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net pension liability	$ (1,354)	$ (386)
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other assets	42	151
Accrued liabilities — employment costs	(55)	(55)
Long-term employment costs	(1,341)	(482)
Net pension liability	$ (1,354)	$ (386)