Employee Benefit Obligations - Change in benefit accounts (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in projected benefit obligation:
Benefit obligation at prior year end	$ 5,493	$ 6,231
Service cost	98	96	$ 77
Interest cost	101	86	128
Benefits paid	(340)	(293)
Net actuarial (gain) loss	(1,556)	(214)
Settlements and other	(20)	(362)
Other	1	2
Effect of exchange rates	(304)	(53)
Benefit obligation at year end	3,473	5,493	6,231
Change in plan assets:
Fair value of plan assets at prior year end	5,490	5,838
Actual return on plan assets	(1,500)	147
Employer contributions	103	192
Contributions to unfunded plans	21	24
Benefits paid	(340)	(293)
Settlements and other	(24)	(380)
Other	2	2
Effect of exchange rates	(347)	(40)
Fair value of plan assets at end of year	3,405	5,490	5,838
Funded status	(68)	(3)
United States
Change in projected benefit obligation:
Benefit obligation at prior year end	2,304	2,752
Service cost	88	83	64
Interest cost	54	50	72
Benefits paid	(200)	(143)
Net actuarial (gain) loss	(557)	(76)
Settlements and other	(20)	(362)
Other	2
Benefit obligation at year end	1,671	2,304	2,752
Change in plan assets:
Fair value of plan assets at prior year end	1,960	2,085
Actual return on plan assets	(425)	205
Employer contributions	100	187
Contributions to unfunded plans	6	6
Benefits paid	(200)	(143)
Settlements and other	(24)	(380)
Fair value of plan assets at end of year	1,417	1,960	2,085
Funded status	(254)	(344)
Accumulated benefit obligation	1,590	2,171
Non U.S.
Change in projected benefit obligation:
Benefit obligation at prior year end	3,189	3,479
Service cost	10	13	13
Interest cost	47	36	56
Benefits paid	(140)	(150)
Net actuarial (gain) loss	(999)	(138)
Other	(1)	2
Effect of exchange rates	(304)	(53)
Benefit obligation at year end	1,802	3,189	3,479
Change in plan assets:
Fair value of plan assets at prior year end	3,530	3,753
Actual return on plan assets	(1,075)	(58)
Employer contributions	3	5
Contributions to unfunded plans	15	18
Benefits paid	(140)	(150)
Other	2	2
Effect of exchange rates	(347)	(40)
Fair value of plan assets at end of year	1,988	3,530	$ 3,753
Funded status	186	341
Accumulated benefit obligation	$ 1,800	$ 3,185