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Retirement and Benefit Plans - Benefit Plans Recognized in OCI (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2026
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 17
Other components of net periodic pension (benefit) expense:
Interest cost	24	42
Expected return on plan assets	(50)	(83)
Amortization of net actuarial losses	1	1
Curtailment gain	(6)	(6)
Expense related to retirement termination benefit	0	11
Total other components of net periodic pension (benefit) expense	(31)	(35)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (21)	$ (18)

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