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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 3,736,000,000 |  | $ 3,704,000,000
Number of loans with an allowance | 0 |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | $ (1,000,000) | $ (1,000,000) |
(Additions)/Reversals | 1,000,000 | 0 |
Deductions | 0 | 0 |
Ending balance | $ 0 | $ (1,000,000) |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 52.00% |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 61.00% |  |
Held-for-sale |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans with an allowance | 0 |  | 0
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value |  |  | $ 23,000,000
Number of loans with an allowance | 0 |  |
Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 3,736,000,000 |  | 3,704,000,000
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (1,000,000) |  |
Ending balance | 0 |  |
Commercial Loan [Member] | Mortgage loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Mortgage loans past due by 90 days or more | 0 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Carrying Value | $ 3,700,000,000 |  | 3,700,000,000
Mortgage loans | Commercial Loan [Member] |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Mortgage loans past due by 90 days or more |  |  | $ 0

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- Definition Number of loans with an allowance + References No definition available. + Details
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- Definition Original weighted average loan to value ratio of commercial mortgage loan. + References No definition available. + Details
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- Definition Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column H -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column H)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21338-158488 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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