Retirement Plans - Schedule of Company Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension Plans Contributions	$ 31	$ 24	$ 86	$ 80
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension Plans Contributions	$ 2	$ 1	$ 4	$ 2