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Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
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
Foreign Exchange Contract | Insurance Claims [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
Foreign Exchange Contract | Investment Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 3 | 0 | 2 | (3)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | (4) | 0 | (4) | 2
Interest Rate Contract | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (3) | 0 | (5) | 0
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 1 | 0 | 2 | 0
Interest Rate Contract | Insurance Claims [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 (Expense) |  |  |  |
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
Financial Futures | Interest Expense [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 |
Financial Futures | Insurance Claims [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (4) |  | (4) |
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 2 |  | 2 |
Financial Futures | Investment Income (Expense) |  |  |  |
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 |

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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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