Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 674	$ 667
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	260	254
Stock-based compensation	40	38
Deferred taxes	(83)	(86)
Net losses from unconsolidated investees	35	42
Other	10	9
Changes in assets and liabilities:
Customer accounts receivable	(484)	(480)
Other current and non-current assets	(88)	(56)
Section 31 fees payable	(105)	(7)
Deferred revenue	406	411
Other current and non-current liabilities	(12)	(36)
Total adjustments	(21)	89
Net cash provided by operating activities	653	756
Investing activities:
Capital expenditures	(21)	(36)
Capitalized software development costs	(64)	(67)
Purchases of invested margin deposits	(463)	(651)
Proceeds from sales of invested margin deposits	2,605	1,709
Other	(12)	(73)
Net cash provided by investing activities	2,045	882
Financing activities:
Repayments of debt	(4)	0
Proceeds from commercial paper, net	0	256
Repurchases of common stock	0	(475)
Dividends to stockholders	(236)	(214)
Change in cash and cash equivalent margin deposits and guaranty funds	(42,059)	14,153
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(49)	(69)
Other	(3)	27
Net cash provided by/(used in) financing activities	(42,351)	13,678
Effect of exchange rate changes on cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	1	(1)
Net increase/(decrease) in cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	(39,652)	15,315
Cash, cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds at beginning of period	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	110,691	163,291
Supplemental cash flow disclosure:
Cash paid for income taxes	149	90
Cash paid for interest	167	117
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 balance sheet:
Cash and cash equivalents	2,069	638
Short-term restricted cash and cash equivalents	6,145	1,101
Long-term restricted cash and cash equivalents	405	405
Cash and cash equivalent margin deposits and guaranty funds	102,072	161,147
Total	$ 110,691	$ 163,291