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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net income $ 651 $ 586
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 533 512
Amortization of debt issuance costs and discount 11 8
Stock-based compensation 104 125
Losses (earnings) from unconsolidated affiliates 1 (1)
Gain on investments, net (12) (10)
Benefit from deferred income taxes (80) (70)
Changes in operating assets and liabilities:    
Change in accounts receivable, unbilled services and unearned income 187 (134)
Change in other operating assets and liabilities (285) (197)
Net cash provided by operating activities 1,110 819
Investing activities:    
Acquisition of property, equipment and software (288) (324)
Acquisition of businesses, net of cash acquired (221) (444)
Purchases of marketable securities, net 0 (4)
Investments in unconsolidated affiliates, net of payments received (49) (13)
Investments in debt and equity securities (2) (36)
Proceeds from sale of property, equipment and software 25 0
Other 0 3
Net cash used in investing activities (535) (818)
Financing activities:    
Proceeds from issuance of debt 0 1,250
Payment of debt issuance costs 0 (18)
Repayment of debt and principal payments on finance leases (86) (77)
Proceeds from revolving credit facility 375 1,559
Repayment of revolving credit facility (585) (1,784)
Payments related to employee stock incentive plans (60) (58)
Repurchase of common stock 0 (619)
Contingent consideration and deferred purchase price payments (10) (71)
Net cash (used in) provided by financing activities (366) 182
Effect of foreign currency exchange rate changes on cash (40) (17)
Increase in cash and cash equivalents 169 166
Cash and cash equivalents at beginning of period 1,376 1,216
Cash and cash equivalents at end of period $ 1,545 $ 1,382