Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income	$ 4,069	$ 2,108	$ 1,960
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,009	751	662
Stock-based compensation	188	139	139
Deferred taxes	537	92	(33)
Gain on deconsolidation of Bakkt	(1,419)	0	0
Gain on sale of Coinbase investment	(1,227)	0	0
Gain on equity investments	(34)	(55)	0
Net losses/(income) from unconsolidated investees	42	(71)	(62)
Other	45	46	22
Changes in assets and liabilities:
Customer accounts receivable	(5)	(149)	(30)
Other current and non-current assets	(100)	(83)	(17)
Section 31 fees payable	(150)	69	34
Deferred revenue	34	2	(18)
Other current and non-current liabilities	134	32	2
Total adjustments	(946)	773	699
Net cash provided by operating activities	3,123	2,881	2,659
Investing activities:
Capital expenditures	(179)	(207)	(153)
Capitalized software development costs	(273)	(203)	(152)
Cash paid for acquisitions, net of cash acquired	(66)	(9,446)	(352)
Return of capital from equity method investment	0	0	60
Purchase of equity method investment	(117)	0	0
Proceeds from the sale of Coinbase investment	1,237	0	0
Proceeds from other investments, net	1	4	9
Purchases of invested margin deposits	(5,050)	(3,371)	(1,890)
Proceeds from sale of invested margin deposits	3,661	2,840	744
Other	0	22	(6)
Net cash used in investing activities	(786)	(10,361)	(1,740)
Financing activities:
Proceeds from debt facilities, net	0	9,606	10
Repayments of debt facilities	(1,246)	(2,004)	0
Proceeds from/(redemption of) commercial paper, net	(1,393)
Proceeds from/(redemption of) commercial paper, net		1,094	360
Repurchases of common stock	(250)	(1,247)	(1,460)
Dividends to stockholders	(747)	(669)	(621)
Change in cash and cash equivalent margin deposits and guaranty funds	65,697	19,256	1,329
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(70)	(74)	(65)
Other	35	38	23
Net cash provided by (used in) financing activities	62,026	26,000	(424)
Effect of exchange rate changes on cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	(6)	8	4
Net increase in cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	64,357	18,528	499
Cash, cash equivalents, restricted cash and cash equivalents and cash and cash equivalent margin deposits and guaranty funds at beginning of year	83,619	65,091	64,592
Cash, cash equivalents, restricted cash and cash equivalents and cash and cash equivalent margin deposits and guaranty funds at end of year	147,976	83,619	65,091
Supplemental cash flow disclosures:
Common stock issued for acquisition	0	1,895	0
Cash paid for income taxes	1,057	642	557
Cash paid for interest	$ 406	$ 298	$ 280