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Pensions And Other Postretirement Benefits Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of Expense [Abstract]        
Amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost, next fiscal year   $ 261    
Change in Assumptions for Pension Plans [Member]        
Components of Expense [Abstract]        
Reduction in Service Cost and Interest Cost   768    
US Pension Plans [Member]        
Components of Expense [Abstract]        
Service Cost Including Administrative Expenses   381 $ 406 $ 380
Service Cost   220 272  
Interest Cost   2,212 2,754 3,060
Expected Return on Plan Assets   (3,778) (3,896) (3,914)
Amortization of Prior Service Cost (Credit)   (4) (4) (4)
Amortization of net actuarial (gains) losses   (25) 8 (91)
Curtailments, Settlements and Other   0 0 (1)
Net periodic pension and OPEB (income) expense   $ (1,214) $ (732) $ (570)
Weighted-average assumptions used to determine benefit obligations [Abstract]        
Discount rate   3.92% 4.06% 3.73%
Weighted-average assumptions used to determine net expense [Abstract]        
Discount rate   3.36% 3.73% 4.46%
Expected return on plan assets   6.33% 6.38% 6.53%
US Pension Plans [Member] | Scenario, Forecast [Member]        
Weighted-average assumptions used to determine net expense [Abstract]        
Expected return on plan assets 6.20%      
Non-US Pension Plans [Member]        
Components of Expense [Abstract]        
Service Cost Including Administrative Expenses   $ 390 $ 431 $ 389
Service Cost   371 405  
Interest Cost   578 763 1,031
Expected Return on Plan Assets   (737) (798) (873)
Amortization of Prior Service Cost (Credit)   14 15 17
Amortization of net actuarial (gains) losses   189 233 154
Curtailments, Settlements and Other   2 124 3
Net periodic pension and OPEB (income) expense   $ 436 $ 768 $ 721
Weighted-average assumptions used to determine benefit obligations [Abstract]        
Discount rate   2.72% 3.20% 3.14%
Rate of compensation increase   2.79% 2.79% 2.85%
Weighted-average assumptions used to determine net expense [Abstract]        
Discount rate   2.99% 3.15% 4.10%
Expected return on plan assets   5.98% 6.23% 6.28%
Rate of compensation increase   2.80% 2.85% 2.90%
Other Postretirement Benefit Plan [Member]        
Components of Expense [Abstract]        
Service Cost   $ 18 $ 24 $ 23
Interest Cost   201 238 273
Expected Return on Plan Assets   0 0 0
Amortization of Prior Service Cost (Credit)   (13) (14) (16)
Amortization of net actuarial (gains) losses   19 37 8
Curtailments, Settlements and Other   0 0 0
Net periodic pension and OPEB (income) expense   $ 225 $ 285 $ 288
Weighted-average assumptions used to determine benefit obligations [Abstract]        
Discount rate   3.93% 4.13% 3.83%
Rate of compensation increase     4.21% 4.21%
Weighted-average assumptions used to determine net expense [Abstract]        
Discount rate   3.49% 3.83% 4.56%
Rate of compensation increase     4.21% 4.21%