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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income $ 141 $ 168
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 564 477
Amortization of debt issuance costs and discount 5 4
Amortization of accumulated other comprehensive loss on terminated interest rate swaps   3
Stock-based compensation 47 53
Impairment of goodwill and identifiable intangible assets   40
(Earnings) loss from unconsolidated affiliates (11) 7
Gain on investments, net (3)  
Benefit from deferred income taxes (114) (198)
Changes in operating assets and liabilities:    
Change in accounts receivable, unbilled services and unearned income (114) (73)
Change in other operating assets and liabilities (22) (180)
Net cash provided by operating activities 493 301
Investing activities:    
Acquisition of property, equipment and software (198) (178)
Acquisition of businesses, net of cash acquired (227) (268)
Investments in unconsolidated affiliates, net of payments received (5) 6
Investments in equity securities (20)  
Net cash used in investing activities (450) (440)
Financing activities:    
Proceeds from issuance of debt 1,631 3,998
Payment of debt issuance costs (20) (23)
Repayment of debt and principal payments on capital lease obligations (682) (2,515)
Proceeds from revolving credit facility 1,460 853
Repayment of revolving credit facility (1,779) (890)
(Payments) proceeds related to employee stock purchase and option plans (2) 69
Repurchase of common stock (668) (1,694)
Distributions to non-controlling interest, net (9) (5)
Contingent consideration and deferred purchase price payments (24) (3)
Net cash used in financing activities (93) (210)
Effect of foreign currency exchange rate changes on cash (30) 53
Decrease in cash and cash equivalents (80) (296)
Cash and cash equivalents at beginning of period 959 1,198
Cash and cash equivalents at end of period $ 879 $ 902