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Fair Value of Assets and Liabilities (Changes in Level 3 Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Fair Value, beginning of period | $ 0 | $ 1 | $ 0
Total gains (losses) (realized/unrealized): |  |  |
Included in earnings | 0 | 1 | 1
Purchases | 0 | 0 | 1
Sales | 0 | (2) | 0
Issuances | 0 | 0 | 0
Settlements | 0 | 0 | (1)
Other | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Fair Value, end of period | 0 | 0 | 1
Unrealized gains (losses) for assets still held: |  |  |
Included in earnings | 0 | 1 | 1
Interest Rate |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Fair Value, beginning of period | 0 | 1 | 0
Total gains (losses) (realized/unrealized): |  |  |
Included in earnings | 0 | 0 | 1
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issuances | 0 | 0 | 0
Settlements | 0 | 0 | 0
Other | 0 | 0 | 0
Transfers into Level 3 | 0 | (1) | 0
Transfers out of Level 3 | 0 | 0 | 0
Fair Value, end of period | 0 | 0 | 1
Unrealized gains (losses) for assets still held: |  |  |
Included in earnings | $ 0 | $ 0 | $ 1

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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