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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | $ 17 |  |  | $ 17
Recorded Investment |  | 17 |  |  | 17
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 17 |  |  | 17
Average Investment | [1] | 17 | $ 24 |  |
Interest Income |  | 0 | 0 |  |
Impaired mortgage loans with valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | 0 |  |  | 0
Recorded Investment |  | 0 |  |  | 0
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 0 |  |  | 0
Average Investment |  | 0 | 0 | [1] |
Interest Income |  | 0 | 0 |  |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  | 17 |  |  | 17
Recorded Investment |  | 17 |  |  | 17
Related Allowance |  | 0 |  |  | 0
Carrying Value |  | 17 |  |  | $ 17
Average Investment |  | 17 | 24 | [1] |
Interest Income |  | $ 0 | $ 0 |  |
[1] | (1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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