Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Interest cost on projected benefit obligation	$ 9	$ 21	$ 27	$ 65
Expected return on plan assets	(14)	(29)	(41)	(87)
Amortization of net actuarial loss (gain)	2	7	6	21
Pension settlement transaction loss	0	4	0	4
Total net periodic pension cost (benefit)	$ (3)	$ 3	$ (8)	$ 3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]			Other operating expenses, Insurance claims and policyholders’ benefits (re-measurement loss of $36, $48, $59 and $88)	Other operating expenses, Insurance claims and policyholders’ benefits (re-measurement loss of $36, $48, $59 and $88)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other operating expenses, Insurance claims and policyholders’ benefits (re-measurement loss of $36, $48, $59 and $88)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other operating expenses, Insurance claims and policyholders’ benefits (re-measurement loss of $36, $48, $59 and $88)
Defined benefit plan net periodic benefit cost credit settlement gain loss statement of income or comprehensive income extensible list not disclosed flag				Pension settlement transaction loss