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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Operating activities:    
Net income $ 885 $ 847
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 901 827
Amortization of debt issuance costs and discount 17 17
Stock-based compensation 243 187
(Earnings) losses from unconsolidated affiliates (65) 14
Loss (gain) on investments, net 7 (20)
Benefit from deferred income taxes (97) (132)
Changes in operating assets and liabilities:    
Change in accounts receivable, unbilled services and unearned income 341 442
Change in other operating assets and liabilities (231) (263)
Net cash provided by operating activities 2,001 1,919
Investing activities:    
Acquisition of property, equipment and software (483) (429)
Acquisition of businesses, net of cash acquired (589) (798)
Sales of marketable securities, net 3 2
Investments in unconsolidated affiliates, net of payments received (67) (28)
Investments in debt and equity securities 0 (20)
Proceeds from sale of property, equipment and software 0 75
Other 0 (3)
Net cash used in investing activities (1,136) (1,201)
Financing activities:    
Proceeds from issuance of debt 3,758 3,985
Payment of debt issuance costs (49) (34)
Repayment of debt and principal payments on finance leases (2,458) (2,676)
Proceeds from revolving credit facility 1,350 1,375
Repayment of revolving credit facility (2,150) (2,200)
Payments related to employee stock incentive plans (43) (66)
Repurchase of common stock (950) (1,032)
Distributions to noncontrolling interests, net (1) 0
Contingent consideration and deferred purchase price payments (17) (26)
Other (9) (11)
Net cash used in financing activities (569) (685)
Effect of foreign currency exchange rate changes on cash (27) 79
Increase in cash and cash equivalents 269 112
Cash and cash equivalents at beginning of period 1,980 1,702
Cash and cash equivalents at end of period $ 2,249 $ 1,814