v3.8.0.1

Investments (Allowance for Credit Losses and Recorded Investment in Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Allowance for credit losses: |  |  |
Individually evaluated for impairment | $ 7 | $ 6 |
Collectively evaluated for impairment | 99 | 100 |
Total ending balance | 106 | 106 | $ 112
Recorded Investment: |  |  |
Individually evaluated for impairment | 116 | 148 |
Collectively evaluated for impairment | 56,035 | 52,737 |
Total ending balance | 56,151 | 52,885 |
Commercial Mortgage Loans |  |  |
Allowance for credit losses: |  |  |
Individually evaluated for impairment | 7 | 6 |
Collectively evaluated for impairment | 90 | 90 |
Total ending balance | 97 | 96 | 97
Recorded Investment: |  |  |
Individually evaluated for impairment | 75 | 116 |
Collectively evaluated for impairment | 52,009 | 48,911 |
Total ending balance | 52,084 | 49,027 |
Agricultural Property Loans |  |  |
Allowance for credit losses: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 3 | 2 |
Total ending balance | 3 | 2 | 2
Recorded Investment: |  |  |
Individually evaluated for impairment | 39 | 30 |
Collectively evaluated for impairment | 3,164 | 2,928 |
Total ending balance | 3,203 | 2,958 |
Residential property loans |  |  |
Allowance for credit losses: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 1 | 2 |
Total ending balance | 1 | 2 | 3
Recorded Investment: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 196 | 252 |
Total ending balance | 196 | 252 |
Other collateralized loans |  |  |
Allowance for credit losses: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 0 | 0 |
Total ending balance | 0 | 0 | 0
Recorded Investment: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 5 | 10 |
Total ending balance | 5 | 10 |
Uncollateralized loans |  |  |
Allowance for credit losses: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 5 | 6 |
Total ending balance | 5 | 6 | $ 10
Recorded Investment: |  |  |
Individually evaluated for impairment | 2 | 2 |
Collectively evaluated for impairment | 661 | 636 |
Total ending balance | $ 663 | $ 638 |

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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