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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net earnings | $ 3,304 | $ 2,920 | $ 4,604
Adjustments to reconcile net earnings to net cash provided by operating activities: |  |  |
Change in receivables and advance premiums | (32) | (55) | (91)
Capitalization of deferred policy acquisition costs | (1,452) | (1,504) | (1,468)
Amortization of deferred policy acquisition costs | 1,282 | 1,245 | 1,132
Increase in policy liabilities | 2,104 | 2,343 | 2,890
Change in income tax liabilities | (244) | 64 | (1,240)
Realized investment (gains) losses | 135 | 430 | 151
Other, net | 358 | 571 | 150
Net cash provided (used) by operating activities | 5,455 | 6,014 | 6,128
Proceeds from investments sold or matured: |  |  |
Available-for-sale fixed maturity securities | 5,284 | 7,888 | 4,680
Equity securities, FV-NI | 650 | 429 |
Equity securities, available for sale |  |  | 902
Held-to-maturity fixed maturity securities | 622 | 1,670 | 2,212
Commercial mortgage and other loans | 1,814 | 936 | 303
Costs of investments acquired: |  |  |
Available for sale fixed maturity securities | (6,934) | (9,086) | (9,867)
Equity securities, FV-NI | (347) | (440) |
Equity securities, available-for-sale |  |  | (446)
Commercial mortgage and other loans | (4,401) | (4,848) | (2,115)
Other investments, net | (653) | (414) | (206)
Settlement of derivatives, net | (9) | (241) | (621)
Cash received (pledged or returned) as collateral, net | 926 | 348 | (205)
Other, net | (123) | 176 | (68)
Net cash provided (used) by investing activities | (3,171) | (3,582) | (5,431)
Cash flows from financing activities: |  |  |
Purchases of treasury stock | (1,627) | (1,301) | (1,351)
Proceeds from borrowings | 615 | 1,020 | 1,040
Principal payments under debt obligations | 0 | (550) | (1,161)
Dividends paid to shareholders | (771) | (793) | (661)
Change in investment-type contracts, net | (1) | (31) | 35
Treasury stock reissued | 49 | 58 | 33
Other, net | 22 | (19) | 0
Net cash provided (used) by financing activities | (1,713) | (1,616) | (2,065)
Effect of exchange rate changes on cash and cash equivalents | (12) | 30 | 0
Net change in cash and cash equivalents | 559 | 846 | (1,368)
Cash and cash equivalents, beginning of period | 4,337 | 3,491 | 4,859
Cash and cash equivalents, end of period | 4,896 | 4,337 | 3,491
Supplemental disclosures of cash flow information: |  |  |
Income taxes paid | 1,384 | 998 | 780
Interest paid | 190 | 181 | 196
Noncash interest | 37 | 41 | 44
Impairment losses and loan loss reserves included in realized investment losses | 31 | 81 | 37
Noncash financing activities: |  |  |
Lease obligations | 132 | 11 | 12
Associate stock bonus |  |  |
Treasury stock issued for: |  |  |
Treasury stock issued | 15 | 7 | 29
Shareholder dividend reinvestment |  |  |
Treasury stock issued for: |  |  |
Treasury stock issued | 30 | 8 | 29
Share-based compensation grants |  |  |
Treasury stock issued for: |  |  |
Treasury stock issued | $ 5 | $ 2 | $ 1

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