Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net income	$ 667	$ 650
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	254	255
Stock-based compensation	38	36
Deferred taxes	(86)	(22)
Net losses/(income) from unconsolidated investees	42	(25)
Other	9	15
Changes in assets and liabilities:
Customer accounts receivable	(480)	(303)
Other current and non-current assets	(56)	(108)
Section 31 fees payable	(7)	(84)
Deferred revenue	411	375
Other current and non-current liabilities	(36)	(55)
Total adjustments	89	84
Net cash provided by operating activities	756	734
Investing activities:
Capital expenditures	(36)	(40)
Capitalized software development costs	(67)	(76)
Purchases of invested margin deposits	(651)	(1,140)
Proceeds from sales of invested margin deposits	1,709	1,700
Other	(73)	0
Net cash provided by investing activities	882	444
Financing activities:
Proceeds from/(redemption of) commercial paper, net	256	(343)
Repurchases of common stock	(475)	0
Dividends to stockholders	(214)	(187)
Change in cash and cash equivalent margin deposits and guaranty funds	14,153	1,471
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(69)	(65)
Other	27	12
Net cash provided by financing activities	13,678	888
Effect of exchange rate changes on cash and cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	(1)	(1)
Net increase in cash and cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds	15,315	2,065
Cash and cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds at beginning of period	147,976	83,619
Cash and cash equivalents, restricted cash and cash equivalents, and cash and cash equivalent margin deposits and guaranty funds at end of period	163,291	85,684
Supplemental cash flow disclosure:
Cash paid for income taxes	90	131
Cash paid for interest	117	128
Reconciliation of the components of cash and 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	638	562
Short-term restricted cash and cash equivalents	1,101	1,065
Long-term restricted cash and cash equivalents	405	398
Cash and cash equivalent margin deposits and guaranty funds	161,147	83,659
Total	$ 163,291	$ 85,684