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Investments (Details 14) - Mortgage loans, non-impaired - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Net carrying value of impaired mortgage loans |  |  |  |  |  |
Impaired mortgage loans with a valuation allowance |  |  |  |  | $ 15 | $ 5
Impaired mortgage loans without a valuation allowance |  |  |  |  | 0 | 0
Total impaired mortgage loans |  |  |  |  | 15 | 5
Valuation allowance on impaired mortgage loans | $ 3 | $ 3 | $ 3 | $ 3 | $ 4 | $ 3
Average carrying value and interest income recognized on impaired mortgage loans |  |  |  |  |  |
Average impaired mortgage loans |  |  | 8 | 6 |  |
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |  |
Beginning balance | 3 | 3 | 3 | 3 |  |
Net increase in valuation allowance | 1 | 0 | 1 | 0 |  |
Charge offs | 0 | 0 | 0 | 0 |  |
Ending balance | $ 4 | $ 3 | $ 4 | $ 3 |  |

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- Definition Average 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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