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Principles of Consolidation And Other Matters (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 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 $ 180,000,000   $ 180,000,000    
Equity method investments lag period     3 months    
Investment income (loss) $ 1,000,000 $ 34,000,000 $ (2,000,000) $ 39,000,000  
Effective tax rate 26.80% 27.90% 28.40% 28.40%  
Unrecognized tax benefits $ 67,000,000   $ 67,000,000   $ 74,000,000
Minimum          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Reasonably possible decrease in unrecognized tax benefits 0   0    
Maximum          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]          
Reasonably possible decrease in unrecognized tax benefits $ 6,000,000   $ 6,000,000