Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net income	$ 1,186	$ 970
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	314	315
Stock-based compensation	73	64
Deferred taxes	(2)	(42)
Other	(10)	(26)
Changes in assets and liabilities:
Customer accounts receivable	(305)	(96)
Other current and non-current assets	(39)	3
Section 31 fees payable	178	63
Deferred revenue	253	229
Other current and non-current liabilities	(270)	(98)
Total adjustments	192	412
Net cash provided by operating activities	1,378	1,382
Investing activities:
Capital expenditures	(48)	(57)
Capitalized software development costs	(96)	(77)
Cash paid for acquisitions, net of cash acquired	(251)	(352)
Return of capital from equity method investment	0	44
Proceeds from investments, net	3	40
Net cash used in investing activities	(392)	(402)
Financing activities:
Proceeds from debt facilities, net	2,449	0
Repayments of debt facilities	(1,256)	0
Proceeds from/(redemption of) commercial paper, net	(611)	347
Repurchases of common stock	(1,099)	(780)
Dividends to stockholders	(330)	(312)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	(72)	(60)
Other	30	23
Net cash used in financing activities	(889)	(782)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(4)	1
Net increase (decrease) in cash, cash equivalents, and restricted cash and cash equivalents	93	199
Cash, cash equivalents, and restricted cash and cash equivalents, beginning of period	2,188	1,872
Cash, cash equivalents, and restricted cash and cash equivalents, end of period	2,281	2,071
Supplemental cash flow disclosure:
Cash paid for income taxes	475	296
Cash paid for interest	$ 149	$ 145