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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | $ 4,074 | $ 3,884
Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 3,846 | 3,693
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 3,428 | 3,286
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 3 | 3
Common/Collective Trusts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 415 | 404
Cash and Cash Equivalents [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 228 | 191
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 983 | 782
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 983 | 782
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Common/Collective Trusts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 0 | 0
Level 2 | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 2,863 | 2,907
Level 2 | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 2,445 | 2,500
Level 2 | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 3 | 3
Level 2 | Common/Collective Trusts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 415 | 404
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 0 | 4
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 0 | 4
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Common/Collective Trusts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate account assets | $ 0 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -URI http://asc.fasb.org/topic&trid=2303980 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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