SEGMENT AND GEOGRAPHICAL INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 5,057,270	$ 1,381,109
Segment gross profit	963,501	538,501
Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,057,270	1,381,109
Segment gross profit	963,501	538,501
Cash App | Operating Segments
Segment Reporting Information [Line Items]
Revenue	4,039,616	527,642
Segment gross profit	495,485	182,732
Seller | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,017,654	853,467
Segment gross profit	468,016	355,769
Transaction-based revenue
Segment Reporting Information [Line Items]
Revenue	959,733	758,101
Transaction-based revenue | Operating Segments
Segment Reporting Information [Line Items]
Revenue	959,733	758,101
Transaction-based revenue | Cash App | Operating Segments
Segment Reporting Information [Line Items]
Revenue	91,959	27,819
Transaction-based revenue | Seller | Operating Segments
Segment Reporting Information [Line Items]
Revenue	867,774	730,282
Subscription and services-based revenue
Segment Reporting Information [Line Items]
Revenue	525,065	255,883
Revenue	557,681	296,235
Subscription and services-based revenue | Operating Segments
Segment Reporting Information [Line Items]
Revenue	557,681	296,235
Subscription and services-based revenue | Cash App | Operating Segments
Segment Reporting Information [Line Items]
Revenue	436,589	193,725
Subscription and services-based revenue | Seller | Operating Segments
Segment Reporting Information [Line Items]
Revenue	121,092	102,510
Hardware revenue
Segment Reporting Information [Line Items]
Revenue	28,788	20,675
Hardware revenue | Operating Segments
Segment Reporting Information [Line Items]
Revenue	28,788	20,675
Hardware revenue | Cash App | Operating Segments
Segment Reporting Information [Line Items]
Revenue	0	0
Hardware revenue | Seller | Operating Segments
Segment Reporting Information [Line Items]
Revenue	28,788	20,675
Bitcoin revenue
Segment Reporting Information [Line Items]
Revenue	3,511,068	306,098
Bitcoin revenue | Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,511,068	306,098
Bitcoin revenue | Cash App | Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,511,068	306,098
Bitcoin revenue | Seller | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0