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Debt Securities, Fair Value Option

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers From Level 2 To Level 3

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers From Level 3 To Level 2

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Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers From NAV To Level 3

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Fair Value, Option, Assets, Carrying Amount

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Federal Home Loan Bank Capital Stock Share Price

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of liabilities classified as other.

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Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($) pricingMethod $ / shares	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) pricingMethod $ / shares	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of pricing methods \| pricingMethod	3		3
Fair value option, debt securities	$ 3,203		$ 3,203		$ 3,470
Debt securities	57,610		57,610		50,791
Transfers from Level 3 to Level 2	55	$ 341	110	$ 283
Transfers from Level 2 to Level 3	68	29	24	31
Transfers from Level NAV to Level 3	$ 0	$ 0	$ 30	$ 0
FHLBI capital stock, stock price (in usd per share) \| $ / shares	$ 100		$ 100
Unobservable Inputs \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	$ 77		$ 77		117
Funds Withheld Reinsurance Assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option, assets carrying amount	4,272		4,272		3,867
Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option, market risk benefit, debt securities	416		416		766
Debt securities	57,610		57,610		50,791
Variable Interest Entity, Primary Beneficiary
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option, debt securities	2,607		2,607		2,698
Notes issued by consolidated VIEs	205		205		258
Variable Interest Entity, Primary Beneficiary \| Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Notes issued by consolidated VIEs	$ 2,466		$ 2,466		$ 2,578