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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	$ 8,247	$ 9,334	$ 9,409	$ 10,659	$ 9,409	$ 9,673
Foreign currency translation adjustments	(35)			14	(60)	(41)
Balance as of end of period	8,217	8,247	9,334	10,959	8,217	10,959
Foreign currency translation [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(734)	(748)	(709)		(709)
Foreign currency translation adjustments	(35)	14	(39)
Income taxes	0	0	0
Balance as of end of period	(769)	(734)	(748)		(769)
Cash flow hedges [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(121)	(73)	(263)		(263)
Unrealized gains	16	(31)	108
Reclassification adjustments to income	109	(28)	133
Income taxes	(26)	11	(51)
Balance as of end of period	(22)	(121)	(73)		(22)
Available-for-sale securities [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	1	1	1		1
Unrealized gains	(1)	0	0
Reclassification adjustments to income	0	0	0
Income taxes	0	0	0
Balance as of end of period	0	1	1		0
Other [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(14)	(13)	(14)		(14)
Unrealized gains	0	0	0
Other	(3)	(1)	1
Balance as of end of period	(17)	(14)	(13)		(17)
AOCI [Member]
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(868)	(833)	(985)	(783)	(985)	(528)
Foreign currency translation adjustments	(35)	14	(39)
Unrealized gains	15	(31)	108
Reclassification adjustments to income	109	(28)	133
Other	(3)	(1)	1
Income taxes	(26)	11	(51)
Balance as of end of period	$ (808)	$ (868)	$ (833)	$ (903)	$ (808)	$ (903)

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