Employee Benefit Plans - Components of Retirement Plan Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined benefit plans:
Total pre-tax comprehensive loss (income)	$ (24)	$ (15)	$ 88
Pension Benefits
Defined benefit plans:
Service cost	$ 48	$ 46	$ 41
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Interest cost	$ 82	$ 79	$ 76
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Expected return on plan assets	$ (83)	$ (89)	$ (83)
Settlement charges	$ (3)	$ 2	$ 0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of actuarial loss	$ 5	$ 5	$ 3
Amortization of prior service (credit)	(19)	(20)	(20)
Net periodic defined benefit plan expense	30	23	17
Net actuarial (gain) loss	(46)	(38)	46
Prior service cost	19	26	19
Total pre-tax comprehensive loss (income)	$ (27)	$ (12)	$ 65