Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 448	$ 674
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Depreciation and other amortization	202	184
Amortization of acquisition-related intangible assets	89	80
Amortization of financing costs, debt discounts and other	105	6
Share-based compensation	34	36
Deferred income taxes	12	80
Gain on sale of business	(10)	(229)
Loss (income) from investments in unconsolidated affiliates	10	(7)
Settlement of interest rate hedge contracts	(183)	0
Other operating activities	(3)	2
Changes in assets and liabilities, net of effects from acquisitions and dispositions:
Trade accounts receivable	60	(11)
Prepaid expenses and other assets	(62)	(64)
Contract costs	(93)	(76)
Accounts payable and other liabilities	(28)	17
Contract liabilities	(2)	(79)
Net cash provided by operating activities from continuing operations	579	613
Cash flows from investing activities:
Capital expenditures, including capitalization of software costs	(210)	(169)
Proceeds from sale of business	10	419
Payments for acquisition of business, including working capital adjustments	54	0
Distributions from unconsolidated affiliates	7	0
Purchases of investments	(3)	(2)
Other investing activities	6	(12)
Net cash (used in) provided by investing activities from continuing operations	(136)	236
Cash flows from financing activities:
Debt proceeds	9,894	1,161
Debt repayments	(2,018)	(1,257)
Payments of debt financing, redemption and other costs	(164)	0
Proceeds from issuance of treasury stock	56	44
Purchases of treasury stock, including employee shares withheld for tax obligations	(185)	(824)
Other financing activities	0	7
Net cash provided by (used in) financing activities from continuing operations	7,583	(869)
Net change in cash and cash equivalents from continuing operations	8,026	(20)
Net cash flows from discontinued operations	0	43
Cash and cash equivalents, beginning balance	415	325
Cash and cash equivalents, ending balance	8,441	348
Discontinued operations cash flow information:
Net cash used in operating activities	0	(7)
Net cash provided by investing activities	0	50
Net cash flows from discontinued operations	$ 0	$ 43