Accumulated other comprehensive loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	$ 21,288	$ 22,732	$ 21,246
Other comprehensive (loss) income before reclassifications	(419)	169	(353)
Amounts reclassified from Accumulated other comprehensive loss	(23)	5	(55)
Other comprehensive income (loss)	442	(174)	408
Balance at the end of the year	22,466	21,288	22,732
Other nonoperating income (expense), net	258	(2)	(69)
Income from discontinued operations, net of income tax expense	0	0	1,190
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(616)	(787)	(425)
Other comprehensive income (loss)	389	(171)	362
Balance at the end of the year	(1,005)	(616)	(787)
Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(439)	(746)	(127)
Balance at the end of the year	(856)	(439)	(746)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(47)	(19)	18
Balance at the end of the year	(63)	(47)	(19)
Pension and Other Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(130)	(22)	(316)
Balance at the end of the year	(86)	(130)	(22)
Noncontrolling Interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	434	575	632
Other comprehensive income (loss)	53	(3)	46
Balance at the end of the year	859	434	575
Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	53	(3)	46
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	0	0	0
Pension and Other Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	0	0	0
Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassifications	(431)	310	(664)
Amounts reclassified from Accumulated other comprehensive loss	(39)	0	(1)
Other comprehensive income (loss)	470	(310)	665
Currency Translation | Reclassifications from Accumulated other comprehensive loss to income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other nonoperating income (expense), net	(39)	0	4
Income from discontinued operations, net of income tax expense			(5)
Cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassifications	(27)	(37)	23
Amounts reclassified from Accumulated other comprehensive loss	11	9	(60)
Other comprehensive income (loss)	16	28	37
Pension and other postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassifications	39	(104)	288
Amounts reclassified from Accumulated other comprehensive loss	5	(4)	6
Other comprehensive income (loss)	(44)	108	(294)
Pension and other postretirement plans | Reclassifications from Accumulated other comprehensive loss to income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other nonoperating income (expense), net	$ 9	$ (7)	$ 8