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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer plans, additional expense $ 6 $ 5 $ 5
Actuarial loss 387    
Defined benefit plan, benefit obligation, asset returns 268    
Amounts of common stock included in plan assets 323 244  
Defined benefit plan, estimated employer contributions 22    
Total contributions   13  
Pension Plan | Non-U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actuarial loss $ 278 242  
Funding level 100.00%    
Target funding level period 6 years    
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%    
Pension Plan | U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actuarial loss $ 109 133  
Other Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actuarial loss $ 7 $ 14