Pension and other postretirement benefits - Schedule of Level 3 Reconciliation for Pension Plans by Asset (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
United States
Change in plan assets
Fair value of plan assets at beginning of year	$ 19	$ 20
Actual return on plan assets, relating to assets still held at reporting date	1	0
Purchases, sales and settlements	(1)	(1)
Transfer (out of) Level 3	(15)
Change due to exchange rate changes	0	0
Fair value of plan assets at end of year	4	19
United States \| Investment funds
Change in plan assets
Fair value of plan assets at beginning of year	11	11
Actual return on plan assets, relating to assets still held at reporting date	0	0
Purchases, sales and settlements	0	0
Transfer (out of) Level 3	(11)
Change due to exchange rate changes	0	0
Fair value of plan assets at end of year	0	11
United States \| Other
Change in plan assets
Fair value of plan assets at beginning of year	8	9
Actual return on plan assets, relating to assets still held at reporting date	1	0
Purchases, sales and settlements	(1)	(1)
Transfer (out of) Level 3	(4)
Change due to exchange rate changes	0	0
Fair value of plan assets at end of year	4	8
Non-U.S.
Change in plan assets
Fair value of plan assets at beginning of year	132	174
Actual return on plan assets, relating to assets still held at reporting date	13	(31)
Purchases, sales and settlements	(10)	0
Transfer (out of) Level 3	0
Change due to exchange rate changes	4	(11)
Fair value of plan assets at end of year	139	132
Non-U.S. \| Real estate
Change in plan assets
Fair value of plan assets at beginning of year	13	17
Actual return on plan assets, relating to assets still held at reporting date	0	(2)
Purchases, sales and settlements	0	0
Transfer (out of) Level 3	0
Change due to exchange rate changes	1	(2)
Fair value of plan assets at end of year	14	13
Non-U.S. \| Assets held by insurance company
Change in plan assets
Fair value of plan assets at beginning of year	113	152
Actual return on plan assets, relating to assets still held at reporting date	11	(31)
Purchases, sales and settlements	(10)	0
Transfer (out of) Level 3	0
Change due to exchange rate changes	3	(8)
Fair value of plan assets at end of year	117	113
Non-U.S. \| Other
Change in plan assets
Fair value of plan assets at beginning of year	6	5
Actual return on plan assets, relating to assets still held at reporting date	2	2
Purchases, sales and settlements	0	0
Transfer (out of) Level 3	0
Change due to exchange rate changes	0	(1)
Fair value of plan assets at end of year	$ 8	$ 6

Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Foreign Currency Exchange Rates

No definition available.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

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