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Fair Value Of Financial Instruments (Schedule of Mortgage Loans With Election Of Fair Value Option) (Details) - USD ($) | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | --- | --- | --- | --- | --- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |
Fair value | $ 487,000,000 | $ 495,000,000 | $ 528,000,000 | $ 537,000,000 | $ 739,000,000 | $ 792,000,000 | $ 818,000,000 | $ 874,000,000
Commercial [Member] |  |  |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |  |  |
Fair value | 487,000,000 |  |  |  | 739,000,000 |  |  |
Aggregate contractual principal | 514,000,000 |  |  |  | 742,000,000 |  |  |
Loans with fair value option in non-accrual | 0 |  |  |  | 0 |  |  |
Loans with fair value option, 90 days past due and still accruing | $ 0 |  |  |  | $ 0 |  |  |

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- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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- Definition This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(2) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + Details
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