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Pensions And Other Postretirement Benefits Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted-average assumptions used to determine net expense(a)      
Non-service cost components of net periodic pension and OPEB income $ 1,700 $ 1,300 $ 1,300
Amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost, next fiscal year 129    
Other Postretirement Benefits Plan [Member]      
Components of expense      
Service cost 20 19 18
Interest cost 195 202 201
Expected return on plan assets 0 0 0
Amortization of net actuarial (gains) losses 54 23 19
Curtailments, settlements and other (19) (5) (13)
Net periodic pension and OPEB (income) expense $ 250 $ 239 $ 225
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 4.19% 3.52% 3.93%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 3.29% 3.39% 3.49%
U.S. [Member] | Pension Plan [Member]      
Components of expense      
Service cost $ 330 $ 315 $ 381
Service cost 209 203  
Interest cost 2,050 2,145 2,212
Expected return on plan assets (3,890) (3,677) (3,778)
Amortization of net actuarial (gains) losses 10 (6) (25)
Curtailments, settlements and other (19) (37) (4)
Net periodic pension and OPEB (income) expense $ (1,519) $ (1,260) $ (1,214)
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 4.22% 3.53% 3.92%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 3.19% 3.35% 3.36%
Expected rate of return on plan assets 6.61% 6.23% 6.33%
U.S. [Member] | Pension Plan [Member] | Forecast [Member]      
Weighted-average assumptions used to determine net expense(a)      
Expected rate of return on plan assets 6.40% 6.60%  
Non-U.S. [Member] | Pension Plan [Member]      
Components of expense      
Service cost $ 163 $ 199 $ 273
Service cost 149 180  
Interest cost 464 473 527
Expected return on plan assets (825) (750) (733)
Amortization of net actuarial (gains) losses 144 157 137
Curtailments, settlements and other 43 8 16
Net periodic pension and OPEB (income) expense $ (11) $ 87 $ 220
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 2.86% 2.66% 2.88%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 2.99% 2.94% 3.14%
Expected rate of return on plan assets 6.09% 5.82% 6.07%