Postretirement Benefit Plans - Plan Assets by Level Three Hierarchy (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 934	$ 1,061	$ 987
U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		385	389	356
Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,813	3,008	$ 2,661
Other | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	934	1,061
Other | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	375	360
Other | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	2,587	2,748
Level 1 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Level 1 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10	29
Level 1 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		120	112
Level 2 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Level 2 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Level 2 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		106	148
Fixed income securities and cash equivalents | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		655	743
Fixed income securities and cash equivalents | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		248	251
Fixed income securities and cash equivalents | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,220	2,278
Fixed income securities and cash equivalents | Other | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	655	743
Fixed income securities and cash equivalents | Other | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	238	222
Fixed income securities and cash equivalents | Other | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	2,045	2,063
Fixed income securities and cash equivalents | Level 1 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Fixed income securities and cash equivalents | Level 1 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		10	29
Fixed income securities and cash equivalents | Level 1 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		71	69
Fixed income securities and cash equivalents | Level 2 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Fixed income securities and cash equivalents | Level 2 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Fixed income securities and cash equivalents | Level 2 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		104	146
Equity securities | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		279	318
Equity securities | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		137	138
Equity securities | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		593	730
Equity securities | Other | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	279	318
Equity securities | Other | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	137	138
Equity securities | Other | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	542	685
Equity securities | Level 1 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Equity securities | Level 1 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Equity securities | Level 1 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		49	43
Equity securities | Level 2 | U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Equity securities | Level 2 | U.S. | Retiree Health Care
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Equity securities | Level 2 | Non-U.S. | Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 2	$ 2

[1] Consists of bond index and equity index funds, measured at net asset value per share, as well as cash equivalents.