Accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	$ 21,288	$ 22,732
Other comprehensive loss before reclassifications	(177)	119
Amounts reclassified from Accumulated other comprehensive loss	(11)	7
Other comprehensive income (loss)	188	(126)
Balance at the end of the year	20,416	21,837
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	(616)	(787)
Other comprehensive income (loss)	181	(114)
Balance at the end of the year	(797)	(673)
Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	(439)	(746)
Balance at the end of the year	(580)	(660)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	(47)	(19)
Balance at the end of the year	(84)	12
Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	(130)	(22)
Balance at the end of the year	(133)	(25)
Noncontrolling Interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of the year	434	575
Other comprehensive income (loss)	7	(12)
Balance at the end of the year	401	582
Accumulated foreign currency adjustment attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	7	(12)
Accumulated gain (loss), net, cash flow hedge, noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	0	0
Accumulated defined benefit plans adjustment attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	0	0
Accumulated foreign currency adjustment including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassifications	(114)	98
Amounts reclassified from Accumulated other comprehensive loss	(34)	0
Other comprehensive income (loss)	148	(98)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassifications	(63)	21
Amounts reclassified from Accumulated other comprehensive loss	26	10
Other comprehensive income (loss)	37	(31)
Pension and other postretirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from Accumulated other comprehensive loss	(3)	(3)
Other comprehensive income (loss)	$ 3	$ 3