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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net income (loss) | $ 737 | $ 707 | $ (512)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 89 | 127 | 178
Deferred income taxes | 10 | (6) | (94)
Share-based compensation | 39 | 27 | 46
Amortization of convertible senior notes and finance lease liabilities | 5 | 22 | 32
(Gain) loss on debt extinguishment | (15) | 22 | 14
Loss on sales of subsidiaries, net of gain | 0 | 15 | 0
Non-cash restructuring charges | 0 | 17 | 60
Impairment losses | 0 | 0 | 470
Other, net | (5) | 4 | 21
Changes in operating assets and liabilities: |  |  |
Receivables | (76) | (530) | 103
Prepaid expenses and other current assets | 28 | 6 | (56)
Medical claims and benefits payable | (107) | (226) | 263
Amounts due government agencies | (303) | (574) | 341
Accounts payable and accrued liabilities | 2 | 45 | (12)
Deferred revenue | 38 | (21) | (34)
Income taxes | (15) | 51 | (16)
Net cash provided by (used in) operating activities | 427 | (314) | 804
Investing activities: |  |  |
Purchases of investments | (2,536) | (1,444) | (2,697)
Proceeds from sales and maturities of investments | 2,302 | 2,445 | 1,759
Purchases of property, equipment and capitalized software | (57) | (30) | (86)
Net cash received from sale of subsidiaries | 0 | 190 | 0
Other, net | (2) | (18) | (38)
Net cash provided by (used in) investing activities | (293) | 1,143 | (1,062)
Financing activities: |  |  |
Repayment of principal amount of convertible senior notes | (240) | (362) | 0
Cash paid for partial settlement of conversion option | (578) | (623) | 0
Cash received for partial settlement of call option | 578 | 623 | 0
Cash paid for partial termination of warrants | (514) | (549) | 0
Proceeds from borrowings under term loan facility | 220 | 0 | 0
Common stock purchases | (47) | 0 | 0
Repayment of credit facility | 0 | (300) | 0
Proceeds from senior notes offerings, net of issuance costs | 0 | 0 | 325
Proceeds from borrowings under credit facility | 0 | 0 | 300
Other, net | 29 | 18 | 11
Net cash (used in) provided by financing activities | (552) | (1,193) | 636
Net (decrease) increase in cash and cash equivalents, and restricted cash and cash equivalents | (418) | (364) | 378
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period | 2,926 | 3,290 | 2,912
Cash and cash equivalents at end of period | 2,508 | 2,926 | 3,290
Cash paid during the period for: |  |  |
Income taxes | 239 | 240 | 7
Interest | 78 | 93 | 78
Schedule of non-cash investing and financing activities: |  |  |
Common stock issued in exchange for convertible senior notes | 0 | 131 | 193
Component of convertible senior notes allocated to additional paid-in capital, net of income taxes | 0 | (23) | (32)
Net increase to additional paid-in capital | 0 | 108 | 161
Common stock used for stock-based compensation | (7) | (6) | (22)
Common stock purchases not settled at end of period | 7 | 0 | 0
Details of sales of subsidiaries: |  |  |
Decrease in carrying amount of assets | 0 | (327) | 0
Decrease in carrying amount of liabilities | 0 | 85 | 0
Transaction costs | 0 | (15) | 0
Cash received from buyers | 0 | 242 | 0
Loss on sale of subsidiaries, net of gain | 0 | (15) | 0
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | 0 | 0 | 0
Call Option |  |  |
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | 132 | 577 | 255
Conversion Option |  |  |
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | $ (132) | $ (577) | $ (255)

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