Employee Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) employee	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit expense	$ 16	$ 21	$ 27
Contributions by employer	$ 194	171	$ 171
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of eligible employees for pension plan (in employee) | employee	0
Defined benefit obligation	$ 1,160	1,080
Defined benefit overfunded (underfunded) status	10	28
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	25	1
Defined benefit overfunded (underfunded) status	(25)	(1)
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	1	33
Defined benefit overfunded (underfunded) status	$ (1)	$ (33)