Pensions And Other Postretirement Benefits - Accumulated Benefit Obligations and Projected Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
U.S.
ABO and PBO [Line Items]
ABO	$ 64,669	$ 61,177
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	64,669	61,177
Fair Value of Plan Assets	59,239	56,102
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	64,684	61,190
Fair Value of Plan Assets	59,239	56,102
Non-U.S.
ABO and PBO [Line Items]
ABO	21,319	19,822
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	10,996	10,289
Fair Value of Plan Assets	3,940	3,485
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	11,079	10,356
Fair Value of Plan Assets	$ 3,940	$ 3,485

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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