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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities: |  |  |
Net (loss) income | $ (512) | $ 52 | $ 143
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 178 | 182 | 126
Impairment losses | 470 | 0 | 0
Deferred income taxes | (94) | 22 | (7)
Share-based compensation | 46 | 26 | 23
Non-cash restructuring charges | 60 | 0 | 0
Amortization of convertible senior notes and lease financing obligations | 32 | 31 | 30
Loss on debt extinguishment | 14 | 0 | 0
Other, net | 21 | 16 | 19
Changes in operating assets and liabilities: |  |  |
Receivables | 103 | (348) | 56
Prepaid expenses and other current assets | (56) | (69) | (35)
Medical claims and benefits payable | 263 | 226 | 482
Amounts due government agencies | 341 | 473 | 202
Accounts payable and accrued liabilities | (12) | (4) | 84
Deferred revenue | (34) | 92 | 24
Income taxes | (16) | (26) | (22)
Net cash provided by operating activities | 804 | 673 | 1,125
Investing activities: |  |  |
Purchases of investments | (2,718) | (1,929) | (1,923)
Proceeds from sales and maturities of investments | 1,771 | 1,966 | 1,126
Purchases of property, equipment and capitalized software | (86) | (176) | (132)
(Increase) decrease in restricted investments held-to-maturity | (12) | 4 | (6)
Net cash paid in business combinations | 0 | (48) | (450)
Other, net | (28) | (19) | (35)
Net cash used in investing activities | (1,073) | (202) | (1,420)
Financing activities: |  |  |
Proceeds from senior notes offerings, net of issuance costs | 325 | 0 | 689
Proceeds from borrowings under credit facility | 300 | 0 | 0
Proceeds from common stock offering, net of issuance costs | 0 | 0 | 373
Proceeds from employee stock plans | 19 | 18 | 18
Cash paid for financing transaction fees | (7) | 0 | 0
Other, net | (1) | 1 | 5
Net cash provided by financing activities | 636 | 19 | 1,085
Net increase in cash and cash equivalents | 367 | 490 | 790
Cash and cash equivalents at beginning of period | 2,819 | 2,329 | 1,539
Cash and cash equivalents at end of period | 3,186 | 2,819 | 2,329
Supplemental cash flow information: |  |  |
Income taxes | 7 | 153 | 197
Interest | 78 | 66 | 38
Schedule of non-cash investing and financing activities: |  |  |
Issuance of common stock in exchange for 1.625% Convertible Notes | 193 | 0 | 0
Component of 1.625% Convertible Notes allocated to additional paid-in capital, net of income taxes | (32) | 0 | 0
Net increase to additional paid-in capital | 161 | 0 | 0
Common stock used for stock-based compensation | (22) | (8) | (15)
Details of business combinations: |  |  |
Fair value of assets acquired | 0 | (186) | (389)
Fair value of liabilities assumed | 0 | 28 | 41
Payable to seller | 0 | 8 | 0
Amounts advanced for acquisitions | 0 | 102 | (102)
Net cash paid in business combinations | 0 | (48) | (450)
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | 0 | 0 | 0
1.125% Call Option |  |  |
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | 255 | (107) | 45
1.125% Conversion Option |  |  |
Details of change in fair value of derivatives, net: |  |  |
Change in fair value of derivatives, net | $ (255) | $ 107 | $ (45)

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The fair value of notes issued in noncash investing and financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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