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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 3,637,000,000 |  | $ 3,704,000,000
Mortgage Loans on Real Estate, Other Additions | $ 0 |  |
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% |  |
Loans serviced | $ 5,900,000,000 |  | 6,000,000,000.0
Loans serviced on behalf of third parties | 3,500,000,000 |  | 3,600,000,000
Servicing rights | 0 |  | 0
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (1,000,000) | $ (1,000,000) |
(Additions)/Reversals | 0 | 0 |
Deductions | 0 | 0 |
Ending balance | (1,000,000) | $ (1,000,000) |
Investments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | 2,400,000,000 |  | 2,400,000,000
Held-for-sale |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 0 |  | 0
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 23,000,000 |  | 23,000,000
Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 3,637,000,000 |  | 3,704,000,000
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (1,000,000) |  |
Ending balance | (1,000,000) |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 3,600,000,000 |  | 3,700,000,000
Commercial Loan [Member] | Mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans past due by 90 days or more | $ 0 |  |
Commercial Loan [Member] | Mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans past due by 90 days or more |  |  | $ 0

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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 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=82921503&loc=d3e21338-158488 + Details
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