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Commitments and Contingencies (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 15, 2018 USD ($) | Sep. 30, 2015 store | Dec. 31, 2018 USD ($) person lease | Mar. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Guarantor obligations, maximum exposure |  |  | $ 250 |
Contractual Obligations To Maintain Levels Of Separate Accounts |  |  | $ 1,400 |
Number of leases guaranteed | lease |  |  | 85 |
Discounted amount of insurance-related assessment liability |  |  |  | $ 231
Insurance-related assessment, discount rate |  |  |  | 3.50%
Guaranty liabilities |  |  | $ 90 |
Number of store locations with subpoenas for documents | store |  | 8 |  |
Provider Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, damages awarded | $ 150 |  |  |
CMS Actions |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Sample size of audit | person |  |  | 200 |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243 + Details
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