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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | $ 3,884 | $ 0
Recurring |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 3,693 |
Recurring | Cash and Cash Equivalents and Account Receivable |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 191 |
Recurring | Debt securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 3,286 |
Recurring | Equity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 3 |
Recurring | Common/collective trusts |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 404 |
Recurring | Level 1 |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 782 |
Recurring | Level 1 | Debt securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 782 |
Recurring | Level 1 | Equity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 0 |
Recurring | Level 1 | Common/collective trusts |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 0 |
Recurring | Level 2 |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 2,907 |
Recurring | Level 2 | Debt securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 2,500 |
Recurring | Level 2 | Equity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 3 |
Recurring | Level 2 | Common/collective trusts |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 404 |
Recurring | Level 3 |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 4 |
Recurring | Level 3 | Debt securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 4 |
Recurring | Level 3 | Equity securities |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | 0 |
Recurring | Level 3 | Common/collective trusts |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate accounts assets | $ 0 |

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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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- Definition The fair value of the assets held by the Entity for the benefit of separate account policyholders. + References Reference 1: 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(a)(11)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6484091&loc=d3e19268-158472 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -URI http://asc.fasb.org/topic&trid=2303980 + Details
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