Pension And Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits - U.S.
Service cost	$ 232	$ 180	$ 467	$ 355
Interest cost	177	189	354	382
Expected return on plan assets	(175)	(142)	(350)	(284)
Amortization of actuarial loss/(gain) and prior service cost	79	79	158	156
Net pension enhancement and curtailment/settlement cost	52	53	104	107
Net benefit cost	365	359	733	716
Pension Benefits - Non-U.S. [Member]
Service cost	171	138	346	277
Interest cost	162	192	323	384
Expected return on plan assets	(216)	(192)	(438)	(389)
Amortization of actuarial loss/(gain) and prior service cost	115	55	234	158
Net benefit cost	232	193	465	430
Other Postretirement Benefits [Member]
Service cost	44	33	89	66
Interest cost	68	79	138	158
Expected return on plan assets	(5)	(4)	(9)	(8)
Amortization of actuarial loss/(gain) and prior service cost	14	4	26	7
Net benefit cost	$ 121	$ 112	$ 244	$ 223