Employee Benefit Obligations - Change in benefit accounts (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in projected benefit obligation:
Benefit obligation at prior year end	$ 3,473	$ 5,493
Service cost	58	98	$ 96
Interest cost	172	101	86
Benefits paid	(267)	(340)
Net actuarial (gain) loss	384	(1,556)
Settlements and other	(2)	(20)
Other	3	1
Effect of exchange rates	101	(304)
Benefit obligation at year end	3,922	3,473	5,493
Change in plan assets:
Fair value of plan assets at prior year end	3,405	5,490
Actual return on plan assets	192	(1,500)
Employer contributions	19	103
Contributions to unfunded plans	23	21
Benefits paid	(267)	(340)
Settlements and other	(2)	(24)
Other	1	2
Effect of exchange rates	105	(347)
Fair value of plan assets at end of year	3,476	3,405	5,490
Funded status	(446)	(68)
United States
Change in projected benefit obligation:
Benefit obligation at prior year end	1,671	2,304
Service cost	53	88	83
Interest cost	86	54	50
Benefits paid	(142)	(200)
Net actuarial (gain) loss	62	(557)
Settlements and other	(2)	(20)
Other	3	2
Benefit obligation at year end	1,731	1,671	2,304
Change in plan assets:
Fair value of plan assets at prior year end	1,417	1,960
Actual return on plan assets	130	(425)
Employer contributions	17	100
Contributions to unfunded plans	7	6
Benefits paid	(142)	(200)
Settlements and other	(2)	(24)
Fair value of plan assets at end of year	1,427	1,417	1,960
Funded status	(304)	(254)
Accumulated benefit obligation	1,640	1,590
Non U.S.
Change in projected benefit obligation:
Benefit obligation at prior year end	1,802	3,189
Service cost	5	10	13
Interest cost	86	47	36
Benefits paid	(125)	(140)
Net actuarial (gain) loss	322	(999)
Other		(1)
Effect of exchange rates	101	(304)
Benefit obligation at year end	2,191	1,802	3,189
Change in plan assets:
Fair value of plan assets at prior year end	1,988	3,530
Actual return on plan assets	62	(1,075)
Employer contributions	2	3
Contributions to unfunded plans	16	15
Benefits paid	(125)	(140)
Other	1	2
Effect of exchange rates	105	(347)
Fair value of plan assets at end of year	2,049	1,988	$ 3,530
Funded status	(142)	186
Accumulated benefit obligation	$ 2,189	$ 1,800