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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	$ 3,661	$ 6,700
Foreign currency translation adjustments	28	(51)
Balance as of end of period	5,348	916
Foreign currency translation
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(348)
Foreign currency translation adjustments	28
Income taxes	0
Balance as of end of period	(320)
Cash flow hedges
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	128
Unrealized losses	(71)
Reclassification adjustments to income	(30)
Income taxes	15
Balance as of end of period	42
Other
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(11)
Unrealized losses	0
Other	21
Balance as of end of period	10
AOCI
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(231)	(796)
Foreign currency translation adjustments	28
Unrealized losses	(71)
Reclassification adjustments to income	(30)
Other	21
Income taxes	15
Balance as of end of period	$ (268)	$ (763)

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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