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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,612 | $ 3,704
Percent of Total | 100.00% | 100.00%
Industrial |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 1,000 | $ 1,108
Percent of Total | 27.70% | 29.90%
Multifamily |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 1,156 | $ 1,138
Percent of Total | 32.00% | 30.70%
Office |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 691 | $ 708
Percent of Total | 19.20% | 19.10%
Retail |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 409 | $ 392
Percent of Total | 11.30% | 10.60%
Residential Real Estate [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 81 | $ 82
Percent of Total | 2.20% | 2.20%
Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 275 | $ 276
Percent of Total | 7.60% | 7.50%
East North Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 250 | $ 250
Middle Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 268 | 270
Mountain |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 33 | 30
New England |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 346 | 330
Pacific |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 884 | 917
South Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 742 | 712
West North Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 121 | 148
West South Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 407 | 420
Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 561 | $ 627
Mortgages [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 100.00% | 100.00%
Mortgages [Member] | East North Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 6.90% | 6.80%
Mortgages [Member] | Middle Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.40% | 7.30%
Mortgages [Member] | Mountain |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 0.90% | 0.80%
Mortgages [Member] | New England |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 9.70% | 8.90%
Mortgages [Member] | Pacific |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 24.50% | 24.80%
Mortgages [Member] | South Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 20.50% | 19.20%
Mortgages [Member] | West North Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 3.30% | 4.00%
Mortgages [Member] | West South Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 11.30% | 11.30%
Mortgages [Member] | Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 15.50% | 16.90%

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