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Derivative Instruments Derivative Instruments (Fair Value Hedge Attributable to Foreign Currency) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair Value Hedge Liabilities | $ (998) |  | $ (1,111)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | (14) |  | (11)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 10 |  | 0
Interest Rate Contract | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 20 | $ (2) |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 20 | (2) |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (25) | 1 |
Interest Rate Contract | Investment Income (Expense) |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Interest Rate Contract | Insurance Claims [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Foreign Exchange Contract | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Foreign Exchange Contract | Investment Income (Expense) |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | (1) |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | (1) |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Foreign Exchange Contract | Insurance Claims [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Financial Futures | Interest Expense [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Financial Futures | Investment Income (Expense) |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 0 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 0 | 0 |
Financial Futures | Insurance Claims [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 13 | 0 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 13 | 0 |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | (13) | $ 0 |
Other Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair Value Hedge Liabilities | (580) |  | (508)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | (6) |  | (7)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | $ 8 |  | $ 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 Fair value of all derivative liabilities designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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