Accumulated Other Comprehensive Income (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
After-tax components of Accumulated other comprehensive income
Currency Translation Adjustment, Balance, beginning of period	$ 36	$ 27
Currency Translation Adjustment, change	6	(2)
Currency Translation Adjustment, Balance, end of period	42	25
Unrealized Gains On Available-for-Sale Securities, Balance, beginning of period	1	0
Unrealized Gains On Available-for-Sale Securities, Change	1	1
Unrealized Gains On Available-for-Sale Securities, Balance, end of period	2	1
Pension Adjustment, Balance, beginning of period	(8)	(8)
Pension Adjustment, Balance, end of period	(8)	(8)
Total, Balance, beginning of period	29	19
Total, Change	7	(1)
Total, Balance, end of period	$ 36	$ 18