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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit plan, additional pension expense $ 5,000,000 $ 5,000,000 $ 5,000,000
Amounts of common stock included in plan assets 244,000,000 140,000,000  
Defined benefit plan, estimated employer contributions 21,000,000    
Total contributions 11,000,000 2,000,000 $ 2,000,000
Employee stock purchase plan, company contribution (less than)   $ 1,000,000  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Estimated net losses of pensions in following twelve months (94,000,000)    
Estimated prior service credits of pensions in following twelve months $ (1,000,000)    
Pension Plan | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Funding level 100.00%    
Target funding level period 7 years    
Expected return net of fees 1.80%    
Percentage change of risk level commensurate 5.00%    
Pension Plan | Non-U.S. Plans | Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Yearly rate of funding level decline 4.00%    
Pension Plan | Non-U.S. Plans | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Yearly rate of funding level decline 7.00%    
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 $ (4,000,000)    
Estimated prior service credits of pensions in following twelve months $ (25,000,000)