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Pension and Other Postretirement Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
NAV per share, investment redemption, notice period   90 days    
Expense for all defined benefit and defined contributions pension plans   $ 281 $ 245 $ 224
Pension benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized prior service credits, before tax   7    
Prior service credit, after tax   5    
Unrecognized actuarial losses, before tax   (464)    
Unrecognized actuarial losses, net of tax   $ (353)    
Pension benefit plans | U.S. Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   6.75% 6.75% 7.00%
Expected employer contributions within the next year   $ 10    
Pension benefit plans | U.S. Pension Benefits | Scenario, forecast        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions 6.75%      
Pension benefit plans | U.S. Pension Benefits | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   60.00%    
Pension benefit plans | U.S. Pension Benefits | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   70.00%    
Pension benefit plans | Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.20% 3.30%  
Expected employer contributions within the next year   $ 35    
Pension benefit plans | Foreign Plan | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   0.80% 0.30%  
Pension benefit plans | Foreign Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   5.30% 5.00%  
Pension benefit plans | Foreign Plan | Weighted average        
Defined Benefit Plan Disclosure [Line Items]        
Long-term rate of return on asset assumptions   3.20% 3.30%  
Other postretirement benefits        
Defined Benefit Plan Disclosure [Line Items]        
Medical trend rate - initial   5.20% 5.30%  
Medical trend rate - ultimate   4.00% 4.00%  
Unrecognized prior service credits, before tax   $ 10    
Prior service credit, after tax   8    
Unrecognized actuarial losses, before tax   (1)    
Unrecognized actuarial losses, net of tax   (1)    
Expected employer contributions within the next year   $ 14