Employee Retirement Benefits - Net Periodic Income Cost Recognized for OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Amortization of unrecognized losses, after Tax	$ 0	$ 0	$ 1
Tax effects on components of net periodic income (cost) recognized in OCI [Abstract]
Amortization of unrecognized losses, Tax	0	0	0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service benefit (cost), after tax	(2)	0	1
Net gains, after tax	54	60	23
Other Comprehensive (Income) Loss Total	52	60	24
Tax effects on components of net periodic income (cost) recognized in OCI [Abstract]
Prior service benefit (cost), tax	0		0
Net gains (losses), tax expense (benefit)	$ 17	$ 19	$ 7