Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	$ (3)	$ (8)	$ (25)
Operating Segments
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	(1)	(8)	(23)
Corporate
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	(2)	0	(2)
North America
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	(8)	(4)	(9)
Europe, Middle East and Africa
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	7	(1)	(9)
Latin America
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	0	(1)	(4)
Asia Pacific
Net (Gains) Losses on Asset Sales:
Net (gains) losses on asset sales	$ 0	$ (2)	$ (1)