Accumulated other comprehensive loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	$ 22,732	$ 21,246	$ 20,412
Other comprehensive (loss) income before reclassifications	169	(353)	(87)
Amounts reclassified from Accumulated other comprehensive loss (i)	5	(55)	(29)
Other comprehensive income (loss)	(174)	408	116
Balance at the end of the year	21,288	22,732	21,246
Other nonoperating (expense) income, net	(2)	(69)	90
Income from discontinued operations, net of income tax expense	0	1,190	179
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(787)	(425)	(344)
Other comprehensive income (loss)	(171)	362	81
Balance at the end of the year	(616)	(787)	(425)
Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(746)	(127)	205
Balance at the end of the year	(439)	(746)	(127)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(19)	18	(1)
Balance at the end of the year	(47)	(19)	18
Pension and Other Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	(22)	(316)	(548)
Balance at the end of the year	(130)	(22)	(316)
Noncontrolling Interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the year	575	632	647
Other comprehensive income (loss)	(3)	46	35
Balance at the end of the year	434	575	632
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	(3)	46	35
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	0	0	0
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss)	0	0	0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassifications	310	(664)	(338)
Amounts reclassified from Accumulated other comprehensive loss (i)	0	(1)	(29)
Other comprehensive income (loss)	(310)	665	367
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Reclassifications from Accumulated other comprehensive loss to income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other nonoperating (expense) income, net		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	(37)	23	48
Amounts reclassified from Accumulated other comprehensive loss (i)	9	(60)	(29)
Other comprehensive income (loss)	28	37	(19)
Pension and other postretirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassifications	(104)	288	203
Amounts reclassified from Accumulated other comprehensive loss (i)	(4)	6	29
Other comprehensive income (loss)	108	(294)	(232)
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 (expense) income, net	$ (7)	$ 8	$ 36