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Receivables, Net Receivables, Net (Schedule of Non-trade Receivables, Net) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]    
Non-income taxes receivable $ 80 $ 82
Reinsurance receivables 22 24
Income taxes receivable 53 66
Other 55 64
Allowance for doubtful accounts - other (1) (1)
Non-trade receivables, net $ 209 $ 235