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Common Stock Repurchases (Details) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended		12 Months Ended
	Mar. 09, 2011	Mar. 17, 2010	Dec. 31, 2011	Dec. 31, 2010
Common Stock Repurchases (Textual) [Abstract]
Maximum amount authorized under stock repurchase program	$ 750,000,000	$ 250,000,000
Value of shares remaining under stock repurchase program			251,200,000
Repurchase of shares, shares			72.4	51.4
Repurchase of shares			$ 498,786,000	$ 249,942,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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