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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits Plan        
Components of expense        
Service cost   $ 18 $ 19 $ 17
Interest cost   123 173 220
Expected return on plan assets   0 0 0
Amortization of net actuarial losses   97 74 30
Curtailments, settlements and other   (6) (8) (23)
Net periodic pension and OPEB (income) expense   $ 232 $ 258 $ 244
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 2.53% 2.97% 2.53% 3.24%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   2.24% 3.00% 4.07%
U.S. | Pension Plan        
Components of expense        
Service cost   $ 260 $ 251 $ 393
Service cost   187 177  
Interest cost   1,074 1,716 2,264
Expected return on plan assets   (3,178) (3,267) (3,483)
Amortization of net actuarial losses   26 16 11
Curtailments, settlements and other   15 17 21
Net periodic pension and OPEB (income) expense   $ (1,803) $ (1,267) $ (794)
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 2.37% 2.78% 2.37% 3.20%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   1.86% 2.84% 3.92%
Expected rate of return on plan assets   5.63% 5.88% 6.37%
Administrative expenses and Pension Benefit Guarantee Corporation premiums       $ 214
U.S. | Pension Plan | Plan        
Weighted-average assumptions used to determine net expense(a)        
Expected rate of return on plan assets   5.40% 5.60%  
Non-U.S. | Pension Plan        
Components of expense        
Service cost   $ 121 $ 145 132
Service cost   109 133  
Interest cost   236 362 456
Expected return on plan assets   (610) (675) (786)
Amortization of net actuarial losses   212 171 122
Curtailments, settlements and other   7 241 142
Net periodic pension and OPEB (income) expense   $ (34) $ 244 $ 66
Weighted-average assumptions used to determine benefit obligations(a)        
Discount rate 1.62% 2.13% 1.62% 2.16%
Weighted-average assumptions used to determine net expense(a)        
Discount rate   2.38% 2.80% 3.36%
Expected rate of return on plan assets   4.67% 4.96% 5.76%
Canada | Pension Plan        
Weighted-average assumptions used to determine net expense(a)        
Payment for annuity purchase $ 1,500      
Non-operating pension settlement charge $ 130