Stock-Based Compensation (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	$ 50
Weighted Average to be Recognized	1.36
Options [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	1
Weighted Average to be Recognized	0.76
Stock Awards [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	15
Weighted Average to be Recognized	1.12
Performance Share Awards [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	34
Weighted Average to be Recognized	1.48
Total [Member]
Share Based Compensation Unrecognized and Non-Vested Cost [Line Items]
Unrecognized Compensation Cost	$ 50
Weighted Average to be Recognized	1.36