Pension, Other Postretirement Benefits and Savings Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	$ (3)	$ (3)
Net actuarial loss	2,160	2,353
Gross amount recognized	2,157	2,350
Deferred income taxes	3	(43)
Minority shareholders’ equity	0	0
Net amount recognized	2,160	2,307
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	26	25
Net actuarial loss	465	636
Gross amount recognized	491	661
Deferred income taxes	(64)	(104)
Minority shareholders’ equity	(1)	(2)
Net amount recognized	426	555
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	(5)	(7)
Net actuarial loss	7	30
Gross amount recognized	2	23
Deferred income taxes	(23)	(29)
Minority shareholders’ equity	0	0
Net amount recognized	$ (21)	$ (6)