Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Accumulated Translation Adjustment [Member]	Mar. 31, 2013 Accumulated Translation Adjustment [Member]	Mar. 31, 2014 Accumulated Defined Benefit Plans Adjustment [Member]	Mar. 31, 2013 Accumulated Defined Benefit Plans Adjustment [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 420	$ 384	$ 155	$ 293
Other comprehensive income (loss) adjustments during the period					28	(154)
Other comprehensive income (loss), adjustments reclassified to income					0	4	10	19
Income taxes							(2)	(7)
Other comprehensive income (loss), net of tax					28	(150)	8	12
Ending balance	$ 420	$ 384	$ 155	$ 293	$ 702	$ 717	$ 282	$ 562