Postemployment benefit plans (Details D2)	Dec. 31, 2021
U.S. pensions | Debt securities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	85.00%
U.S. pensions | Equities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	15.00%
Non-U.S. pensions | Debt securities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	82.00%
Non-U.S. pensions | Equities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	10.00%
Non-U.S. pensions | Real estate
Information about plan asset allocations
Target allocation of plan assets (as a percent)	5.00%
Non-U.S. pensions | Other plan assets
Information about plan asset allocations
Target allocation of plan assets (as a percent)	3.00%
Other postretirement benefits | Debt securities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	30.00%
Other postretirement benefits | Equities
Information about plan asset allocations
Target allocation of plan assets (as a percent)	70.00%