Investments - Payables for Collateral on Investments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Carrying Value
Collateral payable for derivative investments	$ 6,373	$ 7,809
Securities pledged under securities lending agreements	183	145
Investments pledged for FHLB lending program	0	0
Total payables for collateral on investments	6,556	7,954
Fair Value
Collateral payable for derivative investments	6,373	7,809
Securities pledged under securities lending agreements	177	139
Investments pledged for FHLB lending program	0	0
Total payables for collateral on investments	$ 6,550	$ 7,948
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements.	102.00%
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements.	105.00%
Minimum
Fair Value
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities	105.00%
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan	155.00%
Maximum
Fair Value
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities	115.00%
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan	175.00%

Carrying Value Of Payables For Collateral On Investments [Abstract]

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- Definition

This item represents the percentage of the fair value of AFS securities obtained as collateral pledged.

+ References

No definition available.

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- Definition

This item represents the percentage of the fair value of Mortgage loans obtained as collateral pledged.

+ References

No definition available.

+ Details

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- Definition

This item represents the percentage of the fair value of domestic securities obtained as collateral under securities lending agreements

+ References

No definition available.

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This item represents the percentage of the fair value of foreign securities obtained as collateral under securities lending agreements

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No definition available.

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- Definition

When entering into a derivative transaction, the amount of cash received as collateral from a counterparty.

+ References

No definition available.

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The fair value of cash received as collateral from a counterparty.

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No definition available.

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- Definition

Fair Value Of Related Investments Or Collateral [Abstract]

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No definition available.

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- Definition

The amount of cash received as security in return for loaning securities to Federal Home Loan Bank of Indianapolis.

+ References

No definition available.

+ Details

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- Definition

The fair value of investments loaned to Federal Home Loan Bank of Indianapolis as of the balance sheet date.

+ References

No definition available.

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- Definition

The fair value of investments loaned to another party under securities lending agreements as of the balance sheet date.

+ References

No definition available.

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- Definition

The total fair value of investments related to payables for collateral on investments as of the balance sheet date.

+ References

No definition available.

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- Definition

Amount of obligation to return cash received as collateral for security loaned to another party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

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- Definition

Amount, before effects of master netting arrangements, of financial assets loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and financial assets transferred other than securities that qualify as secured borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481395/860-30-55-4

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-Topic 860
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-Name Accounting Standards Codification
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-SubTopic 30
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-7

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