| Dec 31, 2010 | Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income | 66 | 150 | 210 | 252 | 306 | 358 | 343 | 291 | 434 | 454 | 306 | 599 | 658 | 411 | 252 |
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| Allowance for credit losses | 7 | 7 | 7 | 7 | 10 | 12 | 9 | 8 | 12 | 10 | 4 | 9 | 9 | 9 | 5 |
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| Depreciation | 56 | 51 | 48 | 47 | 49 | 53 | 63 | 64 | 64 | 64 | 62 | 52 | 47 | 51 | 52 |
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| Amortization of cloud computing implementation costs | - | - | - | - | - | - | - | - | - | 4 | 18 | 28 | 29 | 45 | 36 |
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| Amortization of intangible assets | 0 | 0 | 0 | 2 | 1 | 0 | 1 | 2 | 2 | 1 | 1 | 2 | 2 | 3 | 1 |
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| Realized and unrealized (gains) losses from investments held in employee deferred compensation trusts | - | - | - | - | - | - | - | - | - | - | 67 | 37 | -99 | 73 | 72 |
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| Stock-based compensation | 57 | 51 | 41 | 39 | 41 | 41 | 43 | 42 | 45 | 48 | 52 | 56 | 58 | 61 | 63 |
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| Deferred income taxes | 7 | 17 | -15 | -13 | -4 | -9 | -2 | 44 | -16 | -9 | -13 | -21 | 11 | -17 | -18 |
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| Accounts receivable | 68 | 81 | 21 | 48 | 135 | 76 | 16 | 17 | 86 | 48 | -128 | 293 | 66 | -156 | -67 |
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| Capitalized cloud computing implementation costs | - | - | - | - | - | - | - | - | - | 30 | 33 | 31 | 40 | 35 | 29 |
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| Accounts payable and accrued expenses | 42 | 65 | 17 | 38 | 72 | 60 | 20 | 48 | 90 | -9 | 1 | 53 | 4 | -15 | 16 |
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| Accrued payroll and benefit cost | - | - | - | - | - | - | - | - | - | 61 | 119 | 99 | -58 | -62 | -33 |
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| Increase (Decrease) in Deferred Compensation | - | - | - | - | - | - | - | - | - | - | 14 | 100 | -61 | 99 | 105 |
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| Income taxes payable | 1 | 6 | 15 | -12 | 16 | 20 | -8 | -10 | 29 | -19 | 0 | 4 | 3 | 11 | -21 |
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| Other assets and liabilities, net | -13 | 6 | 5 | -5 | 8 | 13 | 9 | 19 | 1 | 7 | -3 | 16 | 9 | 8 | 15 |
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| Net cash flows provided by operating activities | 176 | 256 | 289 | 309 | 341 | 438 | 442 | 453 | 572 | 520 | 597 | 603 | 684 | 637 | 410 |
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| Capital expenditures | 35 | 57 | 50 | 54 | 63 | 75 | 83 | 41 | 42 | 59 | 33 | 37 | 61 | 46 | 56 |
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| Investments in employee deferred compensation trusts | - | - | - | - | - | - | - | - | - | 71 | 64 | 85 | 67 | 103 | 69 |
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| Proceeds from employee deferred compensation trust redemptions | - | - | - | - | - | - | - | - | - | - | - | - | 31 | 38 | 39 |
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| Payments for acquisitions, net of cash acquired | 1 | - | 14 | - | - | 15 | 2 | 1 | - | - | 16 | - | 19 | 1 | 0 |
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| Net cash flows used in investing activities | -39 | -63 | -73 | -98 | -89 | -118 | -112 | -78 | -89 | -102 | 9 | -88 | -117 | -112 | -87 |
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| Repurchases of common stock | 155 | 168 | 177 | 168 | 154 | 271 | 176 | 232 | 354 | 278 | 159 | 288 | 320 | 255 | 276 |
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| Dividends paid | 77 | 80 | 84 | 89 | 98 | 108 | 114 | 121 | 136 | 146 | 156 | 171 | 189 | 206 | 220 |
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| Net cash flows used in financing activities | -188 | -226 | -210 | -220 | -230 | -369 | -288 | -353 | -490 | -423 | -315 | -459 | -509 | -461 | -496 |
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| Effect of exchange rate fluctuations | - | - | - | - | - | - | - | - | - | -0 | 13 | -12 | -18 | 9 | -21 |
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| Change in cash and cash equivalents | - | - | - | - | - | - | - | - | - | -6 | 304 | 45 | 40 | 73 | -194 |
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| Interest | - | - | - | - | - | - | - | - | 0 | 0 | 1 | 1 | 0 | 0 | 0 |
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| Income Taxes Paid, Net | 38 | 76 | 136 | 168 | 178 | 213 | 219 | 191 | 137 | 192 | 128 | 220 | 218 | 168 | 144 |
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| Stock Repurchases Awaiting Settlement | - | - | - | - | - | - | - | - | 11 | 6 | 3 | 6 | 4 | 4 | - |
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| Deferred Compensation Plan, Fund Exchanges Within Plan | - | - | - | - | - | - | - | - | - | - | 208 | 117 | 103 | 115 | 131 |
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| Contingent consideration related to acquisition | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 0 | - |
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