Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 458	$ 729	$ 106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	210	188	170
Share-based compensation	69	70	86
Deferred income taxes	301	7	(137)
Reversal of certain Swedish tax benefits	41	0	0
Net gain on divestiture of businesses	(33)	0	0
Gain on sale of investment security	(118)	0	0
Asset impairment charge	0	0	578
Net income from unconsolidated investees	(18)	(15)	(2)
Other reconciling items included in net income	15	25	17
Net change in operating assets and liabilities, net of effects of divestiture and acquisitions:
Receivables, net	(35)	11	73
Other assets	(40)	(30)	(52)
Accounts payable and accrued expenses	33	(12)	5
Section 31 fees payable to SEC	(19)	20	5
Accrued personnel costs	37	(41)	27
Deferred revenue	7	(29)	(75)
Other liabilities	120	(14)	(25)
Net cash provided by operating activities	1,028	909	776
Cash flows from investing activities:
Purchases of securities	(421)	(392)	(468)
Proceeds from sales and redemptions of securities	374	424	411
Proceeds from divestiture of businesses, net	286	0	0
Proceeds from sale of investment security	169	0	0
Acquisition of businesses, net of cash and cash equivalents acquired and other investment activities	(101)	(778)	(1,466)
Purchases of property and equipment	(111)	(144)	(134)
Net cash provided by (used in) investing activities	196	(890)	(1,657)
Cash flows from financing activities:
Proceeds from (repayments of) commercial paper, net	(205)	480	0
Repayments of long-term debt	(115)	(708)	(1,156)
Payment of debt extinguishment cost	0	(9)	0
Proceeds from long-term debt issuances, net of debt issuance costs	0	648	2,456
Repurchases of common stock	(394)	(203)	(100)
Dividends paid	(280)	(243)	(200)
Proceeds received from employee stock activity	17	53	54
Payments related to employee shares withheld for taxes	(50)	(71)	(65)
Proceeds of customer funds	0	0	(38)
Other financing activities	0	0	(3)
Net cash (used in) provided by financing activities	(1,027)	(53)	948
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(10)	15	(6)
Net increase (decrease) in cash and cash equivalents and restricted cash	187	(19)	61
Cash and cash equivalents and restricted cash at beginning of period	399	418	357
Cash and cash equivalents and restricted cash at end of period	586	399	418
Cash paid for:
Interest	148	129	119
Income taxes, net of refund	$ 221	$ 154	$ 191