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Financing Receivables (Credit Quality Information Tables) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,266 | $ 3,263 |  |
Less: allowance for loan losses | 23 | 24 | $ 24 | $ 26
Commercial mortgage loans [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,723 | 2,715 |  |
Less: allowance for loan losses | 19 | 19 |  |
Total loans, net | $ 2,704 | $ 2,696 |  |
Percentage of gross commercial mortgage loans | 100.00% | 100.00% |  |
Commercial mortgage loans [Member] | Apartment Building [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 641 | $ 621 |  |
Percentage of gross commercial mortgage loans | 23.00% | 23.00% |  |
Commercial mortgage loans [Member] | Hotel [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 52 | $ 43 |  |
Percentage of gross commercial mortgage loans | 2.00% | 1.00% |  |
Commercial mortgage loans [Member] | Industrial [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 424 | $ 453 |  |
Percentage of gross commercial mortgage loans | 16.00% | 17.00% |  |
Commercial mortgage loans [Member] | Mixed use [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 72 | $ 54 |  |
Percentage of gross commercial mortgage loans | 3.00% | 2.00% |  |
Commercial mortgage loans [Member] | Office [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 425 | $ 435 |  |
Percentage of gross commercial mortgage loans | 16.00% | 16.00% |  |
Commercial mortgage loans [Member] | Retail [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 906 | $ 897 |  |
Percentage of gross commercial mortgage loans | 33.00% | 33.00% |  |
Commercial mortgage loans [Member] | Other [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 203 | $ 212 |  |
Percentage of gross commercial mortgage loans | 7.00% | 8.00% |  |
Commercial mortgage loans [Member] | East North Central [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 234 | $ 216 |  |
Percentage of gross commercial mortgage loans | 8.00% | 8.00% |  |
Commercial mortgage loans [Member] | East South Central [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 113 | $ 107 |  |
Percentage of gross commercial mortgage loans | 4.00% | 4.00% |  |
Commercial mortgage loans [Member] | Middle Atlantic [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 182 | $ 187 |  |
Percentage of gross commercial mortgage loans | 7.00% | 7.00% |  |
Commercial mortgage loans [Member] | Mountain [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 251 | $ 237 |  |
Percentage of gross commercial mortgage loans | 9.00% | 9.00% |  |
Commercial mortgage loans [Member] | New England [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 55 | $ 62 |  |
Percentage of gross commercial mortgage loans | 2.00% | 2.00% |  |
Commercial mortgage loans [Member] | Pacific [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 806 | $ 814 |  |
Percentage of gross commercial mortgage loans | 30.00% | 30.00% |  |
Commercial mortgage loans [Member] | South Atlantic [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 718 | $ 731 |  |
Percentage of gross commercial mortgage loans | 26.00% | 27.00% |  |
Commercial mortgage loans [Member] | West North Central [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 207 | $ 213 |  |
Percentage of gross commercial mortgage loans | 8.00% | 8.00% |  |
Commercial mortgage loans [Member] | West South Central [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 157 | $ 148 |  |
Percentage of gross commercial mortgage loans | 6.00% | 5.00% |  |
Syndicated loans [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 543 | $ 548 |  |
Financing Receivables, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Nonperforming loans | 21 | 16 |  |
Financing Receivables, Equal to or Greater than 90 Days Past Due [Member] | Syndicated loans [Member] |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Nonperforming loans | $ 8 | $ 0 |  |

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