Accumulated Other Comprehensive Income/(Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Cumulative Translation Adjustment Summary [Roll Forward]
Beginning balance			$ 600	$ 821
Net gain/(loss) on foreign currency translation			141	(93)
Reclassifications to net income			0	11
Other comprehensive income/(loss), net of tax	185	(514)	141	(82)
Ending balance	741	739	741	739
Total AOCI ending balance at September 30	741	739	741	739	600
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Net gain/(loss) on foreign currency translation, tax adjustment			0	0
Reclassifications to net income, tax adjustment			$ 0	$ 0