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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Contributions	$ 317	$ 314	$ 316
2026	129
2027	106
2028	103
2029	99
2030	95
2031-2035	439
Net periodic benefit cost (credit)	(17)	(38)	$ (46)
Net pre-tax actuarial losses that have not been recognized	$ (509)	$ (574)
Fixed maturity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target allocation for plan assets	75.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target allocation for plan assets	20.00%
Other invested assets
Defined Benefit Plan Disclosure [Line Items]
Weighted-average target allocation for plan assets	5.00%