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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,736 | $ 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 | $ 1,156 | $ 1,108
Percent of Total | 30.90% | 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 | 30.90% | 30.70%
Office |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 719 | $ 708
Percent of Total | 19.30% | 19.10%
Retail |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 430 | $ 392
Percent of Total | 11.50% | 10.60%
Residential Real Estate [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 135 | $ 82
Percent of Total | 3.60% | 2.20%
Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 140 | $ 276
Percent of Total | 3.80% | 7.50%
East North Central |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 274 | $ 250
Middle Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 306 | 270
Mountain |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 63 | 30
New England |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 345 | 330
Pacific |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 835 | 917
South Atlantic |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 743 | 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 | 406 | 420
Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 643 | $ 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 | 7.30% | 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 | 8.20% | 7.30%
Mortgages [Member] | Mountain |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 1.70% | 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 | 9.20% | 8.90%
Mortgages [Member] | Pacific |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 22.40% | 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 | 19.90% | 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 | 3.20% | 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 | 10.90% | 11.30%
Mortgages [Member] | Other |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 17.20% | 16.90%

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