Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 1,994	$ 3,311
Separate accounts liabilities	1,994	3,311	$ 3,250
Separate Account Asset
Fair Value, Separate Account Investment [Line Items]
Separate accounts liabilities		188
Total
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,994	3,499
Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	156	165
Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	393	856
Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,445	2,478
Level 1 | Total
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	31	187
Level 1 | Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1	1
Level 1 | Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	30	186
Level 1 | Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	0	0
Level 2 | Total
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,961	3,311
Level 2 | Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	155	164
Level 2 | Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	361	669
Level 2 | Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,445	2,478
Level 3 | Total
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	2	1
Level 3 | Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	0	0
Level 3 | Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	2	1
Level 3 | Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 0	$ 0