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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 3,355,000,000 |  | $ 3,175,000,000
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 51.00% |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 62.00% |  |
Servicing rights | $ 0 |  | 0
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (1,000,000) | $ 0 |
(Additions)/Reversals | 0 | 0 |
Deductions | 0 | 0 |
Ending balance | (1,000,000) | $ 0 |
Mortgage Loans on Real Estate, Other Additions | 0 |  |
Held-for-sale |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 0 |  | 0
Allowance for Loan and Lease Losses [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | 24,000,000 |  | 0
Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage Loans on Real Estate | 3,400,000,000 |  | 3,200,000,000
Mortgage loans | 3,355,000,000 |  | 3,175,000,000
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Ending balance | (1,000,000) |  |
Mortgage loans | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans past due by 90 days or more | 0 |  |
Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans serviced | 5,700,000,000 |  | 1,300,000,000
Loans serviced on behalf of third parties | 3,500,000,000 |  | 402,000,000
Commercial Loan [Member] | Investments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans serviced on behalf of third parties, retained and reported as assets |  |  | 566,000,000
Commercial Loan [Member] | Investments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans serviced on behalf of third parties, retained and reported as assets | $ 2,200,000,000 |  |
Commercial Loan [Member] | Assets Held for Sale |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans serviced on behalf of third parties, retained and reported as assets |  |  | 356,000,000
Mortgage loans | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans past due by 90 days or more |  |  | $ 0

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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 increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Total carrying amount of mortgage loans as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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