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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, additional pension expense $ 5 $ 5 $ 5
Amounts of common stock included in plan assets 140 189  
Defined benefit plan, estimated employer contributions $ 17    
Employee Savings Investment Plan, minimum age requirement 21 years    
Maximum contribution percent by employer 50.00%    
Employer matching contribution, percent of employee's gross pay 3.00%    
Total contributions $ 2 $ 2 $ 2
Percentage of employee stock purchase plan, employee contribution 85.00%    
Percentage of employee stock purchase plan, employer contribution 15.00%    
Shares purchased under employee stock purchase plan (in shares) 32,394 25,511  
Employee stock purchase plan, company contribution (less than) $ 1 $ 1  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Estimated net losses of pensions in following twelve months 96    
Estimated prior service credits of pensions in following twelve months (9)    
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Estimated net losses of pensions in following twelve months 3    
Estimated prior service credits of pensions in following twelve months (34)    
Non-U.S. Plans | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlement charge $ 121 7  
Non-U.S. Plans | Pension Plan | United Kingdom      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Funding level 100.00%    
Target funding level period 8 years    
Expected return net of fees 2.00%    
Percentage change of risk level commensurate 5.00%    
Non-U.S. Plans | Pension Plan | United Kingdom | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Yearly rate of funding level decline 4.00%    
Non-U.S. Plans | Pension Plan | United Kingdom | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Yearly rate of funding level decline 7.00%    
U.S. Plans | Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Settlement charge $ 0 $ 0