Accumulated Other Comprehensive Income/(Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Balance at beginning of period	$ 117	$ 176
Other comprehensive income/(loss) before reclassifications	3	(104)
Amounts reclassified from accumulated other comprehensive income/(loss)	1	1
Other comprehensive income/(loss)	4	(103)
Balance at end of period	121	73
Foreign currency translation
Balance at beginning of period	122	184
Other comprehensive income/(loss) before reclassifications	5	(104)
Amounts reclassified from accumulated other comprehensive income/(loss)	0	0
Other comprehensive income/(loss)	5	(104)
Balance at end of period	127	80
Derivative financial instruments
Balance at beginning of period	(5)	(8)
Other comprehensive income/(loss) before reclassifications	(2)	0
Amounts reclassified from accumulated other comprehensive income/(loss)	1	1
Other comprehensive income/(loss)	(1)	1
Balance at end of period	$ (6)	$ (7)