Accumulated Other Comprehensive Income/(Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011
Balance at beginning of year	$ 176	$ 116
Other comprehensive income/(loss) before reclassifications	(63)
Amounts reclassified from accumulated other comprehensive income/(loss)	4
Other comprehensive income/(loss)	(59)
Balance at end of year	117	116
Foreign currency translation
Balance at beginning of year	184	122
Other comprehensive income/(loss) before reclassifications	(62)
Amounts reclassified from accumulated other comprehensive income/(loss)	0
Other comprehensive income/(loss)	(62)
Balance at end of year	122	122
Derivative financial instruments
Balance at beginning of year	(8)	(6)
Other comprehensive income/(loss) before reclassifications	(1)
Amounts reclassified from accumulated other comprehensive income/(loss)	4
Other comprehensive income/(loss)	3
Balance at end of year	$ (5)	$ (6)