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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined contributions plan expense     $ 3
Funded status of the plans $ 59 $ 64  
Fair value of plan assets 74 70  
Benefit obligation 133 $ 134  
Accumulated other comprehensive loss 21    
Unrecognized net loss 35    
Income tax benefit due to pension plan $ 14    
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution match, percent match 100.00% 100.00% 100.00%
Employer contribution match, percentage of employee contribution 6.00% 6.00% 6.00%
Defined contributions plan expense $ 11 $ 10 $ 9
Non-U.S. Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Cost or expenses included in compensation and benefit expense $ 23 $ 22 $ 21