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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
Dec. 31, 2015
Weighted-average assumptions used to determine net expense(b)        
Amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost, next fiscal year   $ 166    
Other Postretirement Benefits Plan [Member]        
Components of expense        
Service cost   19 $ 18 $ 24
Interest cost   202 201 238
Expected return on plan assets   0 0 0
Amortization of net actuarial (gains) losses   23 19 37
Curtailments, settlements and other   (5) (13) (14)
Net periodic pension and OPEB (income) expense   $ 239 $ 225 $ 285
Weighted-average assumptions used to determine benefit obligations(b)        
Discount rate   3.52% 3.93% 4.13%
Weighted-average assumptions used to determine net expense(b)        
Discount rate   3.39% 3.49% 3.83%
U.S. [Member] | Pension Plan [Member]        
Components of expense        
Service cost   $ 315 $ 381 $ 406
Service cost   203 220  
Interest cost   2,145 2,212 2,754
Expected return on plan assets   (3,677) (3,778) (3,896)
Amortization of net actuarial (gains) losses   (6) (25) 8
Curtailments, settlements and other   (37) (4) (4)
Net periodic pension and OPEB (income) expense   $ (1,260) $ (1,214) $ (732)
Weighted-average assumptions used to determine benefit obligations(b)        
Discount rate   3.53% 3.92% 4.06%
Weighted-average assumptions used to determine net expense(b)        
Discount rate   3.35% 3.36% 3.73%
Expected rate of return on plan assets   6.23% 6.33% 6.38%
U.S. [Member] | Pension Plan [Member] | Forecast [Member]        
Weighted-average assumptions used to determine net expense(b)        
Expected rate of return on plan assets 6.60%      
Non-U.S. [Member] | Pension Plan [Member]        
Components of expense        
Service cost   $ 199 $ 273 $ 306
Service cost   180 255  
Interest cost   473 527 689
Expected return on plan assets   (750) (733) (794)
Amortization of net actuarial (gains) losses   157 137 188
Curtailments, settlements and other   8 16 141
Net periodic pension and OPEB (income) expense   $ 87 $ 220 $ 530
Weighted-average assumptions used to determine benefit obligations(b)        
Discount rate   2.66% 2.88% 3.36%
Weighted-average assumptions used to determine net expense(b)        
Discount rate   2.94% 3.14% 3.30%
Expected rate of return on plan assets   5.82% 6.07% 6.32%