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Investments - Net carrying value of impaired mortgage loans (Details) - Mortgage loans, non-impaired - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Net carrying value of impaired mortgage loans |  |
Impaired mortgage loans with a valuation allowance | $ 6 | $ 4
Impaired mortgage loans without a valuation allowance | 0 | 0
Total impaired mortgage loans | 6 | 4
Valuation allowance on impaired mortgage loans | $ 3 | $ 3

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953550-111524 + Details
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