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Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 969		$ 969		$ 964
Accumulated Amortization	(392)		(392)		(305)
Net carrying value / total estimated amortization expense	577		577		$ 659
Amortization of intangible assets	$ 32	$ 30	$ 94	$ 97
Existing technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	3 years 7 months 6 days		3 years 7 months 6 days		4 years 3 months 18 days
Gross Carrying Value	$ 242		$ 242		$ 241
Accumulated Amortization	(139)		(139)		(117)
Net carrying value / total estimated amortization expense	$ 103		$ 103		$ 124
Merchant relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	8 years 6 months		8 years 6 months		9 years 1 month 6 days
Gross Carrying Value	$ 304		$ 304		$ 302
Accumulated Amortization	(79)		(79)		(56)
Net carrying value / total estimated amortization expense	$ 225		$ 225		246
Courier relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value					12
Accumulated Amortization					(12)
Net carrying value / total estimated amortization expense					$ 0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	8 months 12 days		8 months 12 days		1 year 4 months 24 days
Gross Carrying Value	$ 124		$ 124		$ 123
Accumulated Amortization	(99)		(99)		(69)
Net carrying value / total estimated amortization expense	$ 25		$ 25		$ 54
Trade name and trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	7 years 7 months 6 days		7 years 7 months 6 days		8 years 4 months 24 days
Gross Carrying Value	$ 289		$ 289		$ 286
Accumulated Amortization	(73)		(73)		(51)
Net carrying value / total estimated amortization expense	$ 216		$ 216		$ 235
Assembled workforce in asset acquisition
Finite-Lived Intangible Assets [Line Items]
Weighted-average Remaining Useful Life (in years)	2 years 6 months		2 years 6 months
Gross Carrying Value	$ 10		$ 10
Accumulated Amortization	(2)		(2)
Net carrying value / total estimated amortization expense	$ 8		$ 8