Pension Plans and Other Post Employment Benefit Plans Change in Projected Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation		$ 19,700	$ 21,600
Trust Agreement [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of the period		249
Benefit obligation at end of the period		219	249
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of the period		21,682	21,004
Service Cost		25	26	$ 41
Interest Cost		364	559	769
Plan participants' contributions		3	2
Actuarial (gain) loss		(524)	1,659
Benefits Paid		(1,490)	(1,538)
Plan amendments		(15)	(3)
Net effects of acquisitions / divestitures / other		(240)	0
Effect of foreign exchange rates		(30)	(27)
Benefit obligation at end of the period		19,775	21,682	21,004
Fair value of plan assets at beginning of period		17,835	16,941
Actual return on plan assets		1,685	2,404
Employer contributions		49	62
Plan participants' contributions		3	2
Benefits paid		(1,490)	(1,538)
Net effects of acquisitions / divestitures / other		(240)	0
Effect of foreign exchange rates		(15)	(36)
Fair value of plan assets at end of period		17,827	17,835	16,941
Funded (unfunded) status of plan		(1,948)	(3,847)
Pension Plan | U.S. Plans with Plan Assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan		(1,471)	(3,301)
Pension Plan | Non-U.S. plans with plan assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan		(62)	(98)
Pension Plan | All other plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan	[1],[2]	(415)	(448)
Other Post Employment Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of the period		1,571	2,591
Service Cost		1	2	4
Interest Cost		21	66	84
Plan participants' contributions		35	34
Actuarial (gain) loss		(33)	59
Benefits Paid		(233)	(241)
Plan amendments		0	(939)
Net effects of acquisitions / divestitures / other		0	0
Effect of foreign exchange rates		0	(1)
Benefit obligation at end of the period		1,362	1,571	2,591
Fair value of plan assets at beginning of period		0	0
Actual return on plan assets		0	0
Employer contributions		198	207
Plan participants' contributions		35	34
Benefits paid		(233)	(241)
Net effects of acquisitions / divestitures / other		0	0
Effect of foreign exchange rates		0	0
Fair value of plan assets at end of period		0	0	0
Funded (unfunded) status of plan		(1,362)	(1,571)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax		(1)	0	$ 0
Other Post Employment Benefits Plan | U.S. Plans with Plan Assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan		0	0
Other Post Employment Benefits Plan | Non-U.S. plans with plan assets [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan		0	0
Other Post Employment Benefits Plan | All other plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status of plan	[1],[2]	$ (1,362)	$ (1,571)

[1] As of December 31, 2021 and December 31, 2020, $219 million and $249 million, respectively, of the benefit obligations are supported by funding under the Trust agreement, defined in the "Trust Assets" section below.

[2] Includes pension plans maintained around the world where funding is not customary.