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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Flows from Operating Activities |  |  |
Net income | $ 1,202 | $ 690 | $ 1,000
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |
Deferred income tax expense (benefit) | 47 | (49) | (46)
Trading portfolio activity | 20 | (5) | (16)
Net investment (gains) losses | (120) | 54 | (29)
Equity method investees | (127) | (8) | 11
Net amortization of investments | (81) | (67) | (89)
Depreciation and amortization | 54 | 60 | 68
Changes in: |  |  |
Receivables, net | (1,358) | (409) | 137
Accrued investment income | 3 | 16 | (3)
Deferred acquisition costs | (30) | (43) | (26)
Insurance reserves | 2,463 | 1,681 | 358
Other, net | (76) | (145) | (225)
Net cash flows provided by operating activities | 1,997 | 1,775 | 1,140
Dispositions: |  |  |
Fixed maturity securities - sales | 3,816 | 5,904 | 5,842
Fixed maturity securities - maturities, calls and redemptions | 4,464 | 3,760 | 2,997
Equity securities | 316 | 355 | 214
Limited partnerships | 246 | 373 | 479
Mortgage loans | 190 | 74 | 143
Purchases: |  |  |
Fixed maturity securities | (9,307) | (10,269) | (8,661)
Equity securities | (304) | (452) | (186)
Limited partnerships | (440) | (224) | (198)
Mortgage loans | (95) | (172) | (298)
Change in other investments | (6) | (8) | (11)
Change in short term investments | (83) | (39) | (535)
Purchases of property and equipment | (26) | (23) | (26)
Other, net | 1 | 16 | 15
Net cash flows used by investing activities | (1,228) | (705) | (225)
Cash Flows from Financing Activities |  |  |
Dividends paid to common stockholders | (621) | (950) | (929)
Proceeds from the issuance of debt | 0 | 495 | 496
Repayment of debt | 0 | (419) | (520)
Purchase of treasury stock | (18) | (18) | (23)
Other, net | (9) | (10) | (12)
Net cash flows used by financing activities | (648) | (902) | (988)
Effect of foreign exchange rate changes on cash | (4) | 9 | 5
Net change in cash | 117 | 177 | (68)
Cash, beginning of year | 419 | 242 | 310
Cash, end of period | $ 536 | $ 419 | $ 242

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 + Details
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