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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits Plan        
Components of expense        
Service cost   $ 19 $ 17 $ 20
Interest cost   173 220 195
Expected return on plan assets   0 0 0
Amortization of net actuarial losses   74 30 54
Curtailments, settlements and other   (8) (23) (19)
Net periodic pension and OPEB (income) expense   $ 258 $ 244 $ 250
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 2.53% 2.53% 3.24% 4.19%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   3.00% 4.07% 3.29%
U.S. | Pension Plan        
Components of expense        
Service cost   $ 251 $ 393 $ 330
Service cost   177 179  
Interest cost   1,716 2,264 2,050
Expected return on plan assets   (3,267) (3,483) (3,890)
Amortization of net actuarial losses   16 11 10
Curtailments, settlements and other   17 21 (19)
Net periodic pension and OPEB (income) expense   $ (1,267) $ (794) $ (1,519)
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 2.37% 2.37% 3.20% 4.22%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   2.84% 3.92% 3.19%
Expected rate of return on plan assets   5.88% 6.37% 6.61%
Administrative expenses and Pension Benefit Guarantee Corporation premiums     $ 214 $ 121
U.S. | Pension Plan | Plan        
Weighted-average assumptions used to determine net expense(a)        
Expected rate of return on plan assets   5.60% 5.90%  
Non-U.S. | Pension Plan        
Components of expense        
Service cost   $ 145 $ 132 163
Service cost   133 120  
Interest cost   362 456 464
Expected return on plan assets   (675) (786) (825)
Amortization of net actuarial losses   171 122 144
Curtailments, settlements and other   241 142 43
Net periodic pension and OPEB (income) expense   $ 244 $ 66 $ (11)
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 1.62% 1.62% 2.16% 2.86%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   2.80% 3.36% 2.99%
Expected rate of return on plan assets   4.96% 5.76% 6.09%
Canada | Pension Plan        
Weighted-average assumptions used to determine net expense(a)        
Payment for annuity purchase $ 1,500      
Non-operating pension settlement charge $ 130