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Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Asset Fair Value | $ 250 | $ 358
Liability Fair Value | 327 | 396
Interest rate contracts |  |
Derivative [Line Items] |  |
Hedged asset, fair value hedge | 320 | 307
Hedged asset, fair value hedge, cumulative increase (decrease) | 5 | (8)
Hedged asset, discontinued fair value hedge, cumulative increase (decrease) | 2 | 2
Interest rate contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 15,498 | 14,633
Asset Fair Value | 169 | 246
Liability Fair Value | 265 | 313
Interest rate contracts | Fair Value Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Asset Fair Value | 0 | 0
Liability Fair Value | 0 | 0
Interest rate contracts | Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 271 | 11
Asset Fair Value | 0 | 0
Liability Fair Value | 0 | 0
Foreign exchange contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 264 | 203
Asset Fair Value | 1 | 3
Liability Fair Value | 2 | 6
Foreign exchange contracts | Fair Value Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 140 | 106
Asset Fair Value | 0 | 6
Liability Fair Value | 0 | 0
Foreign exchange contracts | Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 538 | 623
Asset Fair Value | 12 | 46
Liability Fair Value | 19 | 2
Equity contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 278 | 286
Asset Fair Value | 3 | 2
Liability Fair Value | 2 | 9
Credit contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional Amount | 76 | 97
Asset Fair Value | 0 | 0
Liability Fair Value | 0 | 2
Fixed maturities | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Asset Fair Value | 3 | 0
Liability Fair Value | 0 | 4
Embedded derivatives within reinsurance | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Asset Fair Value | 62 | 55
Liability Fair Value | 33 | 41
Managed Custody Guarantees | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Asset Fair Value | 0 | 0
Liability Fair Value | 1 | 4
Stabilizer | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Asset Fair Value | 0 | 0
Liability Fair Value | $ 5 | $ 15

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