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Pension And Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Pension Benefits - U.S.        
Service cost $ 200 $ 200 $ 583 $ 606
Interest cost 199 198 598 594
Expected return on plan assets (194) (182) (582) (545)
Amortization of actuarial loss/(gain) and prior service cost 110 124 332 373
Net pension enhancement and curtailment/settlement cost 187 111 450 333
Net benefit cost 502 451 1,381 1,361
Pension Benefits - Non-U.S. [Member]        
Service cost 155 131 445 430
Interest cost 198 206 574 636
Expected return on plan assets (260) (227) (743) (701)
Amortization of actuarial loss/(gain) and prior service cost 135 151 388 452
Net pension enhancement and curtailment/settlement cost     (5)  
Net benefit cost 228 261 659 817
Other Postretirement Benefits [Member]        
Service cost 36 38 92 115
Interest cost 88 85 227 258
Expected return on plan assets (6) (6) (17) (18)
Amortization of actuarial loss/(gain) and prior service cost 18 29 45 90
Net benefit cost $ 136 $ 146 $ 347 $ 445