Pensions And Other Postretirement Benefits Accumulated Benefit Oblligations and Projected Benefit Obligations (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
U.S. [Member]
ABO and PBO [Line Items]
ABO	$ 61,177	$ 68,437
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	61,177	68,437
Fair Value of Plan Assets	56,102	62,639
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	61,190	68,450
Fair Value of Plan Assets	56,102	62,639
Non-U.S. [Member]
ABO and PBO [Line Items]
ABO	19,822	22,650
Plans with ABO in Excess of Plan Assets [Abstract]
ABO	10,289	21,679
Fair Value of Plan Assets	3,485	13,408
Plans with PBO in Excess of Plan Assets [Abstract]
PBO	10,356	21,822
Fair Value of Plan Assets	$ 3,485	$ 13,411

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

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

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