Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 901	$ 700
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation and other amortization	286	213
Amortization of acquisition-related intangible assets	120	117
Share-based compensation	54	48
Deferred income taxes	105	20
Gain on sale of businesses	(227)	(10)
Loss on early debt extinguishment	8	0
Income from investments in unconsolidated affiliates	(8)	(31)
Dividends from unconsolidated affiliates	1	44
Non-cash impairment charges	3	17
Other operating activities	0	(4)
Changes in assets and liabilities, net of effects from acquisitions and dispositions:
Trade accounts receivable	(29)	23
Prepaid expenses and other assets	(63)	(48)
Contract costs	(107)	(20)
Accounts payable and other liabilities	48	(9)
Contract liabilities	(111)	(45)
Net cash provided by operating activities from continuing operations	981	1,015
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(263)	(208)
Proceeds from sale of businesses	419	19
Payments for acquisitions of businesses, net of cash acquired	0	(383)
Purchases of investments	0	(10)
Other investing activities	(13)	7
Net cash provided by (used in) investing activities from continuing operations	143	(575)
Cash flows from financing activities:
Debt proceeds	3,627	1,946
Debt repayments, including redemption and other costs	(3,256)	(1,410)
Proceeds from issuance of treasury stock	60	65
Purchases of treasury stock, including employee shares withheld for tax obligations	(1,254)	(1,016)
Other financing activities	4	0
Net cash used in financing activities from continuing operations	(819)	(415)
Net change in cash and cash equivalents from continuing operations	305	25
Net change in cash and cash equivalents from discontinued operations	43	0
Cash and cash equivalents, beginning balance	325	300
Cash and cash equivalents, ending balance	673	325
Discontinued operations cash flow information:
Net cash used in operating activities	(7)	0
Net cash provided by investing activities	50	0
Net change in cash and cash equivalents from discontinued operations	$ 43	$ 0