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Receivables, Net Receivables, Net (Schedule of Non-trade Receivables, Net) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Receivables [Abstract]    
Non-income taxes receivable $ 82 $ 82
Reinsurance receivables 24 31
Income taxes receivable 66 60
Other 64 81
Allowance for doubtful accounts - other (1) (1)
Non-trade receivables, net $ 235 $ 253