Income Taxes (Legislative Changes Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2013 MEXICO	Dec. 31, 2013 MEXICO
Income Taxes [Line Items]
Mexico federal statutory tax rate				30.00%
Deferred foreign tax benefit	$ 153	$ (106)	$ (4)		$ (46)
Current foreign tax expense	83	76	32		27
Foreign tax benefit, net					$ (19)