2417403 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Details)
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2417404 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies Medicare Part D (Details)
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2117100 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Notes)
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2217201 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Policies)
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2417406 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies Redeemable Noncontrolling Interests (Details)
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2317302 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Tables)
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2417405 - Disclosure - Basis of Presentation, Uses of Estimates and Significant Accounting Policies Useful lives for property, equipment and capitalized software (Details)
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2432403 - Disclosure - Commercial Paper and Long-Term Debt (Details)
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2432404 - Disclosure - Commercial Paper and Long-Term Debt Maturities of commercial paper and long-term debt (Details)
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2432402 - Disclosure - Commercial Paper and Long-Term Debt (Narrative) (Details)
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2132100 - Disclosure - Commercial Paper and Long-Term Debt (Notes)
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2332301 - Disclosure - Commercial Paper and Long-Term Debt (Tables)
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2436402 - Disclosure - Commitments and Contingencies (Details)
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2436403 - Disclosure - Commitments and Contingencies Future Lease Payments (Details)
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2136100 - Disclosure - Commitments and Contingencies (Notes)
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2336301 - Disclosure - Commitments and Contingencies (Tables)
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1002500 - Statement - Consolidated Balance Sheet (Parenthetical)
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1001000 - Statement - Consolidated Balance Sheets
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1006000 - Statement - Consolidated Statements of Cash Flows
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1005000 - Statement - Consolidated Statements of Changes in Equity
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1004000 - Statement - Consolidated Statements of Comprehensive Income
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1003000 - Statement - Consolidated Statements of Operations
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1003000 - Statement - Consolidated Statements of Operations
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2106100 - Disclosure - Description of Business (Notes)
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0001000 - Document - Document and Entity Information Document
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2428407 - Disclosure - Fair Value Fair Value Inputs Assets Quantitative Information (Details)
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2228201 - Disclosure - Fair Value Fair Value (Policies)
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2428404 - Disclosure - Fair Value (Financial Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details)
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2428405 - Disclosure - Fair Value (Financial Assets and Liabilities, Not Measured at Fair Value on a Recurring Basis) (Details)
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2428403 - Disclosure - Fair Value (Narrative) (Details)
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2128100 - Disclosure - Fair Value (Notes)
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2428406 - Disclosure - Fair Value (Reconciliation of Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details)
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2328302 - Disclosure - Fair Value (Tables)
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2430406 - Disclosure - Goodwill and Intangible Assets Amortization Expense relating to Intangible Assets (Details)
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2430403 - Disclosure - Goodwill and Intangible Assets Changes in the Carrying Amount of Goodwill by Reporting Segment (Details)
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2430402 - Disclosure - Goodwill and Intangible Assets (Details)
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2430404 - Disclosure - Goodwill and Intangible Assets Gross carrying value, accumulated amortization and net carrying value of intangible assets (Details)
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2130100 - Disclosure - Goodwill and Intangible Assets (Notes)
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2330301 - Disclosure - Goodwill and Intangible Assets (Tables)
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2430405 - Disclosure - Goodwill and Intangible Assets Weighted-average useful lives assigned to finite-lived intangible assets acquired in business combinations (Details)
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2433404 - Disclosure - Income Tax Reconciliation of the tax provision at the U.S. Federal Statutory Rate (Details)
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2433405 - Disclosure - Income Taxes Components of Deferred Tax Assets and Liabilities (Details)
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2433402 - Disclosure - Income Taxes (Details)
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2133100 - Disclosure - Income Taxes (Notes)
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2433406 - Disclosure - Income Taxes Reconciliation of the beginning and ending amount of unrecognized tax benefits (Details)
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2433403 - Disclosure - Income Taxes Reconciliation of Provision for Income Taxes (Details)
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2333301 - Disclosure - Income Taxes (Tables)
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2424404 - Disclosure - Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details)
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2424405 - Disclosure - Investments (Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details)
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2424402 - Disclosure - Investments (Narrative) (Details)
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2424406 - Disclosure - Investments (Net Realized Gains) (Details)
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2124100 - Disclosure - Investments (Notes)
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2424403 - Disclosure - Investments (Short-Term and Long-Term Investments) (Details)
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2324301 - Disclosure - Investments (Tables)
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2431402 - Disclosure - Medical Costs Payable (Details)
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2431404 - Disclosure - Medical Costs Payable, Incurred and Paid Medical Cost Development (Details)
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2131101 - Disclosure - Medical Costs Payable (Notes)
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2431403 - Disclosure - Medical Costs Payable Rollforward (Details)
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2331300 - Disclosure - Medical Costs Payable (Tables)
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2429402 - Disclosure - Property, Plant, and Capitalized Software (Details)
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2129100 - Disclosure - Property, Plant, and Capitalized Software (Notes)
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2429403 - Disclosure - Property, Plant, and Capitalized Software Property Plant and Equipment Table (Details)
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2329301 - Disclosure - Property, Plant, and Capitalized Software (Tables)
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2438402 - Disclosure - Quarterly Financial Data (Unaudited) (Details)
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2138100 - Disclosure - Quarterly Financial Data (Unaudited) (Notes)
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2338301 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)
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2439405 - Disclosure - Schedule I Balance Sheet Document (Details)
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2439404 - Disclosure - Schedule I Condensed Balance Sheets (Details)
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2439406 - Disclosure - Schedule I Condensed Statement of Comprehensive Income (Details)
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2439403 - Disclosure - Schedule I (Details)
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2439408 - Disclosure - Schedule I Maturities of Commercial Paper and Long-Term Debt (Details)
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2139100 - Disclosure - Schedule I (Notes)
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2239201 - Disclosure - Schedule I (Policies)
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2439407 - Disclosure - Schedule I Statement of Cash Flows (Details)
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2339302 - Disclosure - Schedule I (Tables)
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2437403 - Disclosure - Segment Financial Information (Details)
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2437402 - Disclosure - Segment Financial Information (Narrative) (Details)
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2137100 - Disclosure - Segment Financial Information (Notes)
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2337301 - Disclosure - Segment Financial Information (Tables)
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2435402 - Disclosure - Share-Based Compensation Narrative (Details)
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2135100 - Disclosure - Share-Based Compensation (Notes)
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2435405 - Disclosure - Share-Based Compensation Other Share-Based Compensation Data (Details)
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2435404 - Disclosure - Share-Based Compensation (Restricted Share Activity) (Details)
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2435406 - Disclosure - Share-Based Compensation (Share-Based Compensation Principal Fair Value Assumptions) (Details)
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2435403 - Disclosure - Share-Based Compensation (Stock Option and SAR Activity) (Details)
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2335301 - Disclosure - Share-Based Compensation (Tables)
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2434402 - Disclosure - Shareholders' Equity (Details)
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2134100 - Disclosure - Shareholders' Equity (Notes)
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2434403 - Disclosure - Shareholders' Equity Share Repurchases (Details)
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2334301 - Disclosure - Shareholders' Equity (Tables)
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