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Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 5,342 | $ 4,072 |  |
Short-term investments | 722 | 531 |  |
Other current assets | 784 | 687 |  |
Total current assets | 11,998 | 8,703 |  |
Long-term investments | 6,861 | 5,312 |  |
Other long-term assets | 527 | 454 |  |
Total assets | 30,901 | 21,855 | $ 20,197 |
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND STOCKHOLDERS’ EQUITY |  |  |  |
Current liabilities | 11,971 | 9,332 |  |
Long-term debt | 6,648 | 4,695 |  |
Other long-term liabilities | 1,259 | 952 |  |
Total liabilities | 19,878 | 14,979 |  |
Redeemable noncontrolling interests | 10 | 12 |  |
Stockholders’ equity: |  |  |  |
Preferred stock, $.001 par value; authorized 10,000 shares; no shares issued or outstanding at December 31, 2018 and December 31, 2017 | 0 | 0 |  |
Common stock, $.001 par value; authorized 800,000 shares; 417,695 issued and 412,478 outstanding at December 31, 2018, and 360,758 issued and 346,874 outstanding at December 31, 2017 | 0 | 0 |  |
Additional paid-in capital | 7,449 | 4,349 |  |
Accumulated other comprehensive loss | (56) | (3) |  |
Retained earnings | 3,663 | 2,748 |  |
Treasury stock, at cost (5,217 and 13,884 shares, respectively) | (139) | (244) |  |
Total Centene stockholders’ equity | 10,917 | 6,850 |  |
Noncontrolling interest | 96 | 14 |  |
Total stockholders’ equity | 11,013 | 6,864 | 5,909 | $ 2,168
Total liabilities, redeemable noncontrolling interests and stockholders’ equity | 30,901 | 21,855 |  |
Parent Company |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 6 | 6 | $ 5 | $ 4
Short-term investments | 2 | 2 |  |
Other current assets | 61 | 46 |  |
Total current assets | 69 | 54 |  |
Long-term investments | 14 | 17 |  |
Investment in subsidiaries | 17,409 | 11,303 |  |
Other long-term assets | 278 | 302 |  |
Total assets | 17,770 | 11,676 |  |
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND STOCKHOLDERS’ EQUITY |  |  |  |
Current liabilities | 109 | 100 |  |
Long-term debt | 6,521 | 4,624 |  |
Other long-term liabilities | 117 | 76 |  |
Total liabilities | 6,747 | 4,800 |  |
Redeemable noncontrolling interests | 10 | 12 |  |
Stockholders’ equity: |  |  |  |
Preferred stock, $.001 par value; authorized 10,000 shares; no shares issued or outstanding at December 31, 2018 and December 31, 2017 | 0 | 0 |  |
Common stock, $.001 par value; authorized 800,000 shares; 417,695 issued and 412,478 outstanding at December 31, 2018, and 360,758 issued and 346,874 outstanding at December 31, 2017 | 0 | 0 |  |
Additional paid-in capital | 7,449 | 4,349 |  |
Accumulated other comprehensive loss | (56) | (3) |  |
Retained earnings | 3,663 | 2,748 |  |
Treasury stock, at cost (5,217 and 13,884 shares, respectively) | (139) | (244) |  |
Total Centene stockholders’ equity | 10,917 | 6,850 |  |
Noncontrolling interest | 96 | 14 |  |
Total stockholders’ equity | 11,013 | 6,864 |  |
Total liabilities, redeemable noncontrolling interests and stockholders’ equity | $ 17,770 | $ 11,676 |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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