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Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Foreign Exchange Contract | Investment Income [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ (4) | $ (7) | $ (7) | $ (8)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 3 | 8 | 5 | 13
Foreign Exchange Contract | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 | 0 | 0
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 0 | $ 0 | 0 | $ 0
Interest Rate Contract | Investment Income [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 |  | 0 |
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 0 |  | 0 |
Interest Rate Contract | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (2) |  | (2) |
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | $ 2 |  | $ 2 |

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 25 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480238/815-25-50-1 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 25 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480238/815-25-50-1 + Details
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