Employee Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) employee	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit expense	$ 21	$ 27	$ 25
Contributions by employer	$ 171	171	$ 168
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of eligible employees for pension plan (in employee) | employee	0
Defined benefit obligation	$ 1,080	1,470
Defined benefit overfunded (underfunded) status	28	49
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	33	3
Defined benefit overfunded (underfunded) status	(33)	(3)
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation	1	42
Defined benefit overfunded (underfunded) status	$ (1)	$ (42)