Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Foreign currency translation
Beginning balance	$ (1,508)	$ (910)
Gains (losses) on foreign currency translation	(104)	(323)
Less: Tax provision /(benefit)	11	24
Net gains (losses) on foreign currency translation	(115)	(347)
(Gains) losses reclassified to earnings	0	0
Less: Tax provision /(benefit)	0	0
Net (gains) losses reclassified to earnings	0	0
Other comprehensive income (loss), net of tax	(115)	(347)
Ending balance	(1,623)	(1,257)
Pension and other postretirement benefits:
Beginning balance	(62)	(32)
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)	(1)	(10)
Less: Tax provision /(benefit)	0	(2)
Net amortization of prior service (credit) cost	(1)	(8)
Pension and other post retirement benefits	(1)	(8)
Ending balance	(63)	(40)
Derivative financial instruments:
Beginning balance	(3)	0
Amount of gains (losses) recognized in AOCI	47	79
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	10	16
Gains (losses) deferred, net of tax	37	63
Amount of gain (losses) reclassified from AOCI	(19)	(118)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(5)	(24)
Net (gains) losses reclassified to earnings	(14)	(94)
Other comprehensive income (loss), net of tax	23	(31)
Ending balance	20	(31)
Available-for-sale securities:
Beginning balance	20	54
Gains (losses) deferred	(79)	(21)
Less: Tax provision /(benefit)	(15)	(5)
Net gains (losses) deferred	(64)	(16)
(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	(64)	(16)
Ending balance	(44)	38
Accumulated other comprehensive income (loss)	$ (1,710)	$ (1,290)	$ (1,553)