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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Aug. 16, 2005
officer
Operating Leased Assets [Line Items]        
Rent expense $ 33 $ 34 $ 39  
Number of former officers being sued | officer       2
Pre-tax charge for litigation settlement $ 13      
Minimum        
Operating Leased Assets [Line Items]        
Lease terms 1 year      
Maximum        
Operating Leased Assets [Line Items]        
Lease terms 16 years