Stockholders' (Deficit) Equity (Narrative) (Details) (USD $) Share data in Millions, except Per Share data	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2011	Jul. 27, 2010	Sep. 30, 2011
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,100,000,000
Remaining common stock available for repurchase			831,300,000
Common stock repurchase, share	7.9		16.3
Average stock price	$ 29.69		$ 32.76
Aggregate cost of share	235,000,000		534,600,000
Special dividend declared, per share			$ 2.75
Special dividend paid			463,500,000
Special dividends declaration date			Apr. 27, 2011
Special dividends payable date			May 18, 2011
Common stock, held in treasury	157.3		157.3
Common stock repurchased	4,600,000,000		4,600,000,000
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Average stock price	$ 30.39		$ 33.87
Common stock repurchased	0.1		0.4
Aggregate cost of share of treasury stock	3,100,000		14,200,000
2008 Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		393,600,000
2010 Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,500,000,000