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Pension and Postretirement Benefit Plans - US Pension Weighted Averages and Expected Returns Information (Details) - Funded - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Qualified and Non-qualified Pension Benefits        
Benefit Plan Information        
Company contributions $ 207 $ 366    
Qualified and Non-qualified Pension Benefits | Maximum        
Asset Allocation assumption        
Estimated pension contributions for next fiscal year       $ 200
Qualified and Non-qualified Pension Benefits | Minimum        
Asset Allocation assumption        
Estimated pension contributions for next fiscal year       $ 100
Postretirement Benefits        
Benefit Plan Information        
Company contributions $ 3 $ 4    
Weighted-average assumptions used to determine benefit obligations        
Discount rate 3.27% 4.41% 3.79%  
Percentage increase (decrease) in discount rate obligation from the prior year (1.14%)      
Weighted-average assumptions used to determine net cost for years ended        
Discount rate - service cost 4.53% 3.86% 4.50%  
Discount rate - interest cost 4.15% 3.52% 3.80%  
Expected return on assets 6.43% 6.53% 6.48%  
United States        
Weighted-average assumptions used to determine benefit obligations        
Original percentage medical inflation indexation by company in year 3.00%      
Revised percentage medical inflation indexation by company in year 1.50%      
United States | Qualified and Non-qualified Pension Benefits        
Benefit Plan Information        
Company contributions $ 101 $ 254    
Weighted-average assumptions used to determine benefit obligations        
Discount rate 3.25% 4.36% 3.68%  
Compensation rate increase 3.21% 4.10% 4.10%  
Percentage increase (decrease) in discount rate obligation from the prior year (1.11%)      
Impact to the Projected Benefit Obligation (PBO) as a result of a change in discount rate $ 2,000      
Weighted-average assumptions used to determine net cost for years ended        
Discount rate - service cost 4.44% 3.78% 4.42%  
Discount rate - interest cost 4.02% 3.35% 3.61%  
Expected return on assets 7.00% 7.25% 7.25%  
Compensation rate increase 4.10% 4.10% 4.10%  
International | Qualified and Non-qualified Pension Benefits        
Benefit Plan Information        
Company contributions $ 106 $ 112    
Weighted-average assumptions used to determine benefit obligations        
Discount rate 1.81% 2.50% 2.41%  
Compensation rate increase 2.88% 2.89% 2.89%  
Weighted-average assumptions used to determine net cost for years ended        
Discount rate - service cost 2.39% 2.27% 2.32%  
Discount rate - interest cost 2.26% 2.14% 2.25%  
Expected return on assets 4.90% 5.02% 5.16%  
Compensation rate increase 2.89% 2.89% 2.90%  
Qualified | United States | Qualified and Non-qualified Pension Benefits        
Asset Allocation assumption        
Rate of return on plan assets 16.30% (0.50%) 12.40%  
Average annual actual return on plan assets over the past 10 years 8.90%      
Number years of used in the calculation of one average annual actual return on plan assets 10 years      
Average annual actual return on plan assets over the past 25 years 9.40%      
Number years of used in the calculation of a second average annual actual return on plan assets 25 years      
Company's assumption for the expected return on plan assets        
Expected return on assets for next fiscal year 6.75%      
Qualified | United States | Qualified and Non-qualified Pension Benefits | Primary U.S. Qualified Pension Plan        
Company's assumption for the expected return on plan assets        
Expected return on assets 7.00%      
Qualified | United States | Qualified and Non-qualified Pension Benefits | Global equity        
Asset Allocation assumption        
Asset allocation assumption for next fiscal year       23.00%
Qualified | United States | Qualified and Non-qualified Pension Benefits | Private equity        
Asset Allocation assumption        
Asset allocation assumption for next fiscal year       14.00%
Qualified | United States | Qualified and Non-qualified Pension Benefits | Fixed income        
Asset Allocation assumption        
Asset allocation assumption for next fiscal year       47.00%
Qualified | United States | Qualified and Non-qualified Pension Benefits | Absolute return        
Asset Allocation assumption        
Asset allocation assumption for next fiscal year       16.00%