Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Foreign currency translation
Beginning balance	$ (2,328)	$ (1,508)
Gains (losses) on foreign currency translation	103	(104)
Less: Tax provision /(benefit)	(10)	11
Net gains (losses) on foreign currency translation	113	(115)
(Gains) losses reclassified to earnings	494	0
Less: Tax provision /(benefit)	0	0
Net (gains) losses reclassified to earnings	494	0
Other comprehensive income (loss), net of tax	607	(115)
Ending balance	(1,721)	(1,623)
Pension and other postretirement benefits:
Beginning balance	(39)	(62)
Current year prior service credit (cost)	0	0
Pension and other postretirement benefits, Current year prior service credit (cost), tax (provision)/benefit	0	0
Net current year prior service credit (cost)	0	0
Amortization of prior service credit (cost)	(3)	(1)
Less: Tax provision /(benefit)	(1)	0
Net amortization of prior service (credit) cost	(2)	(1)
Pension and other post retirement benefits	(2)	(1)
Ending balance	(41)	(63)
Derivative financial instruments:
Beginning balance	28	(3)
Amount of gains (losses) recognized in AOCI	56	47
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	12	10
Gains (losses) deferred, net of tax	44	37
Amount of gain (losses) reclassified from AOCI	52	(19)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	12	(5)
Net (gains) losses reclassified to earnings	40	(14)
Other comprehensive income (loss), net of tax	84	23
Ending balance	112	20
Available-for-sale securities:
Beginning balance	(118)	20
Gains (losses) deferred	26	(79)
Less: Tax provision /(benefit)	4	(15)
Net gains (losses) deferred	22	(64)
(Gains) losses reclassified to earnings	0	0
Available-for-sale securities, (Gains) losses reclassified to earnings, tax (provision)/benefit	0	0
Net (gains) losses reclassified to earnings	0	0
Other comprehensive income (loss), net of tax	22	(64)
Ending balance	(96)	(44)
Accumulated other comprehensive income (loss)	$ (1,746)	$ (1,710)	$ (2,457)