Employee Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) employee	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of eligible employees for pension plan (in employee) | employee	0
Defined benefit expense	$ 17	$ 16	$ 21
Contributions by employer	212	194	$ 171
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	1,100	1,160
Defined benefit overfunded (underfunded) status	26	10
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	19	1
Defined benefit overfunded (underfunded) status	(19)	(1)
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	1	25
Defined benefit overfunded (underfunded) status	$ (1)	$ (25)