Pension and Other Postretirement Benefits - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 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	$ 307	$ 263
Provision for income taxes	(78)	(65)
Net income from continuing operations	246	200
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	25
Prior service credit	(5)	(7)
Income from continuing operations before taxes and equity in net earnings of affiliates	9	18
Provision for income taxes	(2)	(3)
Net income from continuing operations	$ 7	$ 15