Retirement Programs - Funded Status (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Benefit Obligation ("PBO")
Plan settlement	$ (91)
Change in Plan Assets
Other long-term assets		$ 139	$ 55
Other current liabilities		(38)	(34)
Other long-term liabilities		(1,802)	(2,963)
Deferred tax benefit (Note 7)		(305)	(560)
Pensions
Change in Benefit Obligation ("PBO")
Service cost		155	150	$ 142
Interest cost		151	208	261
Change in Plan Assets
Fair value of plan assets, January 1		9,963
Fair value of plan assets, December 31		10,416	9,963
OPEB
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		172	192
Service cost		2	2	2
Interest cost		3	5	7
Divestitures		0	0
Participant contributions		11	11
Plan amendment		0	(13)
Actuarial loss (gain)		(8)	(2)
Benefits paid		(23)	(22)
Plan settlement		0	0
Plan curtailment		0	0
Foreign currency translation and other changes			(1)
Benefit obligation, December 31		157	172	192
Change in Plan Assets
Fair value of plan assets, January 1		0	0
Actual return on plan assets		0	0
Company contributions		0	0
Participant contributions		0	0
Benefits paid from plan assets		0	0
Divestitures		0	0
Foreign currency translation and other changes		0	0
Fair value of plan assets, December 31		0	0	0
Other long-term assets		0	0
Other current liabilities		(14)	(12)
Other long-term liabilities		(143)	(160)
Funded Status, End of Year		(157)	(172)
Net actuarial loss (gain)		(16)	(11)
Prior service cost (credit)		(13)	(15)
Deferred tax benefit (Note 7)		8	5
Amount recognized in accumulated other comprehensive income (loss) (Note 7)		(21)	(21)
U.S. | Pensions
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		2,746	2,552
Service cost		37	37
Interest cost		46	68
Divestitures		0	0
Participant contributions		0	0
Plan amendment		0	0
Actuarial loss (gain)		(94)	250
Benefits paid		(145)	(152)
Plan settlement		(7)	(9)
Plan curtailment		0	0
Foreign currency translation and other changes		0	0
Benefit obligation, December 31		2,583	2,746	2,552
Accumulated benefit obligation ("ABO")		2,503	2,646
Change in Plan Assets
Fair value of plan assets, January 1		2,310	2,048
Actual return on plan assets		281	386
Company contributions			25
Participant contributions		0
Benefits paid from plan assets		(143)	(149)
Divestitures		0	0
Foreign currency translation and other changes		0	0
Fair value of plan assets, December 31		2,448	2,310	2,048
Other long-term assets		15	2
Other current liabilities		(12)	(9)
Other long-term liabilities		(138)	(429)
Funded Status, End of Year		(135)	(436)
Net actuarial loss (gain)		383	687
Prior service cost (credit)		0	0
Deferred tax benefit (Note 7)		(96)	(182)
Amount recognized in accumulated other comprehensive income (loss) (Note 7)		287	505
Non-U.S. | Pensions
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		9,987	8,689
Service cost		118	113
Interest cost		105	140
Divestitures		(13)	0
Participant contributions		19	18
Plan amendment			7
Actuarial loss (gain)		(209)	893
Benefits paid		(331)	(320)
Plan settlement		(13)	(14)
Plan curtailment		0	(1)
Foreign currency translation and other changes		(286)	462
Benefit obligation, December 31		9,377	9,987	8,689
Accumulated benefit obligation ("ABO")		9,278	9,830
Change in Plan Assets
Fair value of plan assets, January 1		7,653	6,888
Actual return on plan assets		728	641
Company contributions		42	66
Participant contributions		19	18
Benefits paid from plan assets		(272)	(267)
Divestitures		(14)	0
Foreign currency translation and other changes		(188)	307
Fair value of plan assets, December 31		7,968	7,653	$ 6,888
Other long-term assets		124	53
Other current liabilities		(12)	(13)
Other long-term liabilities		(1,521)	(2,374)
Funded Status, End of Year		(1,409)	(2,334)
Net actuarial loss (gain)		1,075	1,766
Prior service cost (credit)		6	9
Deferred tax benefit (Note 7)		(217)	(383)
Amount recognized in accumulated other comprehensive income (loss) (Note 7)		864	1,392
United Kingdom | Pensions
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		6,012
Benefit obligation, December 31		5,879	6,012
Change in Plan Assets
Fair value of plan assets, January 1		5,355
Fair value of plan assets, December 31		5,577	5,355
Funded Status, End of Year		(302)	(657)
Germany | Pensions
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		2,582
Benefit obligation, December 31		2,240	2,582
Change in Plan Assets
Fair value of plan assets, January 1		1,258
Fair value of plan assets, December 31		1,359	1,258
Funded Status, End of Year		(881)	(1,324)
Other Non-U.S. | Pensions
Change in Benefit Obligation ("PBO")
Benefit obligation, January 1		1,393
Benefit obligation, December 31		1,258	1,393
Change in Plan Assets
Fair value of plan assets, January 1		1,040
Fair value of plan assets, December 31		1,032	1,040
Funded Status, End of Year		$ (226)	$ (353)