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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-average assumptions used to determine net expense(a)      
Administrative expenses and Pension Benefit Guarantee Corporation premiums $ 214 $ 121  
Amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost, next fiscal year 258    
Other Postretirement Benefits Plan      
Components of expense      
Service cost 17 20 $ 19
Interest cost 220 195 202
Expected return on plan assets 0 0 0
Amortization of net actuarial (gains) losses 30 54 23
Curtailments, settlements and other (23) (19) (5)
Net periodic pension and OPEB (income) expense $ 244 $ 250 $ 239
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 3.24% 4.19% 3.52%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 4.07% 3.29% 3.39%
U.S. | Pension Plan      
Components of expense      
Service cost $ 393 $ 330 $ 315
Service cost 179 209  
Interest cost 2,264 2,050 2,145
Expected return on plan assets (3,483) (3,890) (3,677)
Amortization of net actuarial (gains) losses 11 10 (6)
Curtailments, settlements and other 21 (19) (37)
Net periodic pension and OPEB (income) expense $ (794) $ (1,519) $ (1,260)
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 3.20% 4.22% 3.53%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 3.92% 3.19% 3.35%
Expected rate of return on plan assets 6.37% 6.61% 6.23%
U.S. | Pension Plan | Plan      
Weighted-average assumptions used to determine net expense(a)      
Expected rate of return on plan assets 5.90% 6.40%  
Non-U.S. | Pension Plan      
Components of expense      
Service cost $ 132 $ 163 $ 199
Service cost 120 149  
Interest cost 456 464 473
Expected return on plan assets (786) (825) (750)
Amortization of net actuarial (gains) losses 122 144 157
Curtailments, settlements and other 142 43 8
Net periodic pension and OPEB (income) expense $ 66 $ (11) $ 87
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 2.16% 2.86% 2.66%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 3.36% 2.99% 2.94%
Expected rate of return on plan assets 5.76% 6.09% 5.82%