Pension and Other Postretirement Benefits - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income from continuing operations before taxes and equity in net earnings of affiliates	$ 402	$ 319	$ 709	$ 582
Provision for income taxes	(85)	(146)	(163)	(211)
Net income from continuing operations	329	176	575	376
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Actuarial losses	14	26	27	51
Prior service credit	(5)	(6)	(10)	(13)
Income from continuing operations before taxes and equity in net earnings of affiliates	9	20	17	38
Provision for income taxes	(2)	(5)	(4)	(8)
Net income from continuing operations	$ 7	$ 15	$ 13	$ 30