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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net income | $ 565 | $ 412 | $ 327
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Depreciation and amortization | 491 | 473 | 401
Stock-based compensation expense | 46 | 20 | 50
Below market intangible amortization | (50) | (88) | (82)
Deferred income taxes | 88 | 29 | (27)
(Gain) Loss on disposal of property, plant and equipment | (4) | 10 | 16
Changes in operating assets and liabilities, net of acquisitions |  |  |
Accounts receivable and unbilled accounts receivable | (76) | 315 | (6)
Inventories | (41) | 181 | 256
Accounts payable | 109 | (269) | (144)
Accrued income taxes | (4) | 57 | 11
Accrued liabilities and customer deposits | 84 | (91) | (12)
Other assets and liabilities | (135) | (265) | 226
Net cash provided by operating activities | 1,073 | 784 | 1,016
Investing Activities |  |  |
Purchase of property, plant and equipment | (130) | (136) | (186)
Proceeds from disposal of property, plant and equipment | 25 | 21 | 4
Acquisitions of business, net of cash acquired | (435) | (40) | (2,996)
Net cash used for investing activities | (540) | (155) | (3,178)
Financing Activities |  |  |
Proceeds from debt, net of issuance costs | 5,391 | 3,878 | 3,982
Payments of debt | (5,552) | (4,077) | (3,424)
Repurchase of stock | (300) | (207) | 0
Payment of contingent consideration on acquisitions | (99) | (115) | (10)
Cash dividends | (92) | (93) | (82)
Other financing activities | (1) | (5) | (5)
Net cash (used for) provided by financing activities | (653) | (619) | 461
Effect of changes in currency exchange rates | (6) | (15) | (37)
Decrease in cash | (126) | (5) | (1,738)
Cash and cash equivalents, beginning of year | 599 | 604 | 2,342
Cash and cash equivalents, end of year | $ 473 | $ 599 | $ 604

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