CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 1,429	$ 1,320	$ 1,008
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	200	192	158
Stock-based compensation	136	130	123
Deferred income taxes	(38)	(99)	88
CCXI Gain	0	0	(60)
Purchase Price Hedge Gain	0	0	(111)
ROU Asset impairment & other non-cash restructuring/impairment charges	38
Loss pursuant to the divestiture of MAKS	(14)	0	0
Changes in assets and liabilities:
Accounts receivable	(134)	(136)	(148)
Other current assets	(88)	(9)	(70)
Other assets	(69)	(17)	12
Lease obligations	(16)	0	0
Accounts payable and accrued liabilities	77	(134)	(638)
Restructuring liability	0	42	(6)
Deferred revenue	76	139	73
Unrecognized tax positions and other non-current tax liabilities	8	59	63
Other liabilities	42	(26)	263
Net cash provided by operating activities	1,675	1,461	755
Cash flows from investing activities
Capital additions	(69)	(91)	(91)
Purchases of investments	(138)	(193)	(170)
Sales and maturities of investments	174	161	239
Receipts from Purchase Price Hedge	0	0	111
Cash received upon disposal of a business, net of cash transferred to purchaser	226	6	0
Cash paid for acquisitions, net of cash acquired	(162)	(289)	(3,511)
Receipts from settlements of net investment hedges	12	0	2
Payments for settlements of net investment hedges	(7)	0	0
Net cash provided by (used in) investing activities	36	(406)	(3,420)
Cash flows from financing activities
Issuance of notes	824	1,090	2,292
Repayment of notes	(950)	(800)	(300)
Issuance of commercial paper	1,317	989	1,837
Repayment of commercial paper	(1,320)	(1,120)	(1,707)
Proceeds from stock-based compensation plans	45	47	56
Repurchase of shares related to stock-based compensation	(77)	(62)	(49)
Treasury shares	(991)	(203)	(200)
Dividends	(378)	(337)	(290)
Dividends to noncontrolling interests	(3)	(5)	(3)
Payment for noncontrolling interest	(12)	0	(9)
Debt issuance costs, extinguishment costs and related fees	(18)	(11)	(27)
Net cash used in financing activities	(1,563)	(412)	1,600
Effect of exchange rate changes on cash and cash equivalents	(1)	(30)	85
Increase (decrease) in cash and cash equivalents	147	613	(980)
Cash and cash equivalents, beginning of period	1,685	1,072	2,052
Cash and cash equivalents, end of period	$ 1,832	$ 1,685	$ 1,072