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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |
Net income | $ 5,576 | $ 4,847 | $ 2,160
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation, amortization and other non-cash items | 686 | 647 | 511
Realized capital gains (losses) | (1,356) | (1,885) | 877
Pension and other postretirement remeasurement (gains) losses | (51) | 114 | 468
Gain on disposition of operations | (4) | (6) | (6)
Interest credited to contractholder funds | 638 | 640 | 654
Impairment of purchased intangibles | 0 | 106 | 0
Changes in: |  |  |
Policy benefits and other insurance reserves | (682) | (508) | 469
Unearned premiums | 598 | 801 | 915
Deferred policy acquisition costs | (125) | (85) | (296)
Premium installment receivables, net | (3) | (299) | (396)
Reinsurance recoverables, net | (11) | 320 | (656)
Income taxes | (232) | 487 | (380)
Other operating assets and liabilities | 457 | (50) | 855
Net cash provided by operating activities | 5,491 | 5,129 | 5,175
Proceeds from sales |  |  |
Fixed income securities | 31,950 | 29,849 | 33,183
Equity securities | 8,405 | 5,277 | 6,859
Limited partnership interests | 1,350 | 756 | 764
Mortgage loans | 230 | 0 | 0
Other investments | 340 | 303 | 533
Investment collections |  |  |
Fixed income securities | 2,235 | 2,570 | 3,466
Mortgage loans | 626 | 695 | 529
Other investments | 209 | 254 | 488
Investment purchases |  |  |
Fixed income securities | (38,121) | (31,317) | (36,960)
Equity securities | (4,648) | (7,176) | (5,936)
Limited partnership interests | (1,265) | (1,332) | (1,679)
Mortgage loans | (203) | (844) | (664)
Other investments | (371) | (666) | (864)
Change in short-term and other investments, net | (3,871) | (725) | (603)
Purchases of property and equipment, net | (308) | (433) | (277)
Acquisition of operations | 1 | (18) | (558)
Net cash used in investing activities | (3,441) | (2,807) | (1,719)
Cash flows from financing activities |  |  |
Proceeds from issuance of long-term debt | 1,189 | 491 | 498
Redemption and repayment of long-term debt | 0 | (317) | (400)
Proceeds from issuance of preferred stock | 0 | 1,414 | 557
Redemption of preferred stock | (288) | (1,132) | (385)
Contractholder fund deposits | 991 | 996 | 1,010
Contractholder fund withdrawals | (1,494) | (1,662) | (1,967)
Dividends paid on common stock | (668) | (653) | (614)
Dividends paid on preferred stock | (108) | (134) | (134)
Treasury stock purchases | (1,737) | (1,735) | (2,303)
Shares reissued under equity incentive plans, net | 63 | 120 | 73
Other | 41 | 129 | 91
Net cash used in financing activities | (2,011) | (2,483) | (3,574)
Net increase (decrease) in cash | 39 | (161) | (118)
Cash at beginning of year | 338 | 499 | 617
Cash at end of year | $ 377 | $ 338 | $ 499

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