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Pension and Postretirement Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Maximum employee contribution of eligible pay, percent 75.00%    
Semi-annual discretionary company contribution target, percent 2.00%    
Total expense related to participants in the savings plan $ 192 $ 178 $ 101
Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for plan assets 43.00%    
Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for plan assets 41.00%    
Real Estate Investment      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for plan assets 8.00%    
Other Types of Investments      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for plan assets 8.00%    
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Company match of participant's contributions of eligible pay, percent   5.00%  
Semi-annual discretionary company contribution target, percent 0.00%    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Company match of participant's contributions of eligible pay, percent 6.00%    
Semi-annual discretionary company contribution target, percent 6.00%    
United States      
Defined Benefit Plan Disclosure [Line Items]      
Expected future employer contributions next fiscal year $ 50    
Pension Benefits | United States      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligations 2,855 $ 2,466  
Net actuarial gain (loss) $ (380) $ 167  
Weighted-average actual return on plan assets 20.00% (4.00%)  
Actual increase (reduction) in plan assets $ 478 $ (122)  
Pension Benefits | Int’l.      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligations 1,068 878  
Net actuarial gain (loss) (186) 165  
Actual increase (reduction) in plan assets 121 (29)  
Expected future employer contributions next fiscal year 25    
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) (6) 9  
Actual increase (reduction) in plan assets $ 0 $ 0  
Health care cost trend rate, percentage 6.75%    
Health care cost trend rate, ultimate, percentage 5.00%