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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 79 | $ 120
Florida |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 12 | 32
New Mexico |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 21 | 43
Ohio |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 12 | 12
Puerto Rico |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 11 | 10
Other |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 23 | $ 23

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- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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