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Level 4~Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 51.00% |
Carrying Value | $ 3,221 | $ 3,175
Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 830 | 817
Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 1,043 | 1,006
Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 749 | 751
Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 365 | 367
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 234 | 234
East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 251 | 251
Middle Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 272 | 272
Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 31 | 31
New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 292 | 293
Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 828 | 760
South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 693 | 710
West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 148 | 149
West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 277 | 278
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 429 | 431
Allowance for Loan and Lease Losses [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 24 | $ 0
Mortgages [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 100.00% | 100.00%
Mortgages [Member] | Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 25.80% | 25.70%
Mortgages [Member] | Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 32.40% | 31.70%
Mortgages [Member] | Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 23.30% | 23.70%
Mortgages [Member] | Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 11.20% | 11.50%
Mortgages [Member] | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.30% | 7.40%
Mortgages [Member] | East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.80% | 7.90%
Mortgages [Member] | Middle Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.40% | 8.60%
Mortgages [Member] | Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 1.00% | 1.00%
Mortgages [Member] | New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 9.10% | 9.20%
Mortgages [Member] | Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 25.70% | 23.90%
Mortgages [Member] | South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 21.50% | 22.40%
Mortgages [Member] | West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 4.60% | 4.70%
Mortgages [Member] | West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.60% | 8.70%
Mortgages [Member] | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 13.30% | 13.60%

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- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
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