Consolidated Statements of Cash Flows $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Operating activities:
Net income	$ 2,802	$ 2,438	$ 1,498
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,537	1,215	1,031
Stock-based compensation	231	257	155
Deferred taxes	(142)	(329)	(593)
Fair value loss on Promissory Note	0	160	0
(Gain)/loss on investments	(1)	(4)	41
Net losses from and impairment of unconsolidated investees	62	122	1,340
Other	55	63	41
Changes in assets and liabilities:
Customer accounts receivable	(149)	(71)	20
Other current and non-current assets	(106)	(41)	(196)
Section 31 fees payable	237	(144)	166
Deferred revenue	27	(16)	(27)
Other current and non-current liabilities	54	(116)	160
Total adjustments	1,807	1,104	2,056
Net cash provided by operating activities	4,609	3,542	3,554
Investing activities:
Capital expenditures	(406)	(190)	(225)
Capitalized software development costs	(346)	(299)	(257)
Cash paid for acquisitions, net of cash acquired	(38)	(10,198)	(59)
Proceeds from sale of Promissory Note	75	0	0
Purchases of invested margin deposits	(1,391)	(1,588)	(6,935)
Proceeds from sales of invested margin deposits	1,097	3,974	7,483
Purchases of equity and equity method investments	(29)	(8)	(73)
Proceeds from the sale of equity investments	0	187	741
Purchases of restricted investments	(752)	(1,312)	0
Proceeds from sales of restricted investments	855	641	0
Proceeds from/(purchases of) other investments, net	0	(4)	2
Other investing activities	14	0	0
Net cash provided by/(used in) investing activities	(921)	(8,797)	677
Financing activities:
Proceeds from debt issuances	739	2,400	7,891
Repayments of debt	(1,600)	(2,286)	(2,705)
(Redemption of)/proceeds from commercial paper, net	(1,424)	1,954	(1,012)
Repurchases of common stock	0	0	(632)
Dividends paid to stockholders	(1,039)	(955)	(853)
Change in cash and cash equivalent margin deposits and guaranty funds liability	3,463	(65,396)	(4,493)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(81)	(78)	(73)
Other financing activities	21	16	36
Net cash provided by/(used in) financing activities	79	(64,345)	(1,841)
Effect of exchange rate changes on cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	(14)	7	(23)
Net increase/(decrease) in cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	3,753	(69,593)	2,367
Cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds at beginning of period	80,750	150,343	147,976
Cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds at end of period	84,503	80,750	150,343
Supplemental cash flow disclosure:
Cash paid for income taxes	957	909	882
Cash paid for interest	870	727	550
Reconciliation of the components of cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds to the consolidated balance sheets:
Cash and cash equivalents	844	899	1,799
Short-term restricted cash and cash equivalents	1,142	531	6,149
Long-term restricted cash and cash equivalents	368	340	405
Cash and cash equivalent margin deposits and guaranty funds	82,149	78,980	141,990
Total	$ 84,503	$ 80,750	$ 150,343