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Commitments and Contingencies Level 4 (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Self Insurance Reserve	$ 53,100,000	$ 52,700,000
Loss Contingency, Range of Possible Loss, Minimum	950,000,000
Loss Contingency, Range of Possible Loss, Maximum	$ 1,500,000,000

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.