Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Dec. 31, 2010
Income Tax Disclosure Details [Abstract]
Effective Income Tax Rate	30.90%	45.80%
Write Off Of Deferred Tax Assets			$ 2	$ 9
Write-off of deferred tax assets related to health care referom				9
Tax benefit related to foreign tax	$ 9		$ 9