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Principles of Consolidation And Other Matters (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements $ 197,000,000    
Equity method investments lag period 3 months    
Investment (loss) income $ (3,000,000) $ 2,000,000  
Effective tax rate 28.60% 29.20%  
Unrecognized tax benefits $ 76,000,000   $ 74,000,000
Minimum      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Reasonably possible decrease in unrecognized tax benefits 0    
Maximum      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Reasonably possible decrease in unrecognized tax benefits $ 6,000,000