Employee Benefit Plans - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Percentage of non-matching employer's contribution to eligible participants (as a percent)	1.00%
Employer's Common stock held under 401 (k) plan (in shares)	5.6
Market value of employer's Common stock held under 401 (k) plan	$ 282
Cash dividend received on employer's common stock held under 401 (k) plan	11
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	(30)
Accumulated other comprehensive income, unrecognized actuarial losses	235
Projected benefit obligation with projected benefit obligations	1,400	$ 1,500
Accumulated benefit obligation with projected benefit obligations	1,400	1,500
Fair value of plan assets for pension plans with projected benefit obligations	1,000	$ 1,000
Contributions and expected future benefit payments	25
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service (credit) cost	1
Accumulated other comprehensive income, unrecognized actuarial losses	$ 15
Increase in annual rate	8.70%
Annual rate for per capita cost of covered health care benefits assumed for 2031 and thereafter (as a percent)	4.50%
Contributions and expected future benefit payments	$ 13
Minimum | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization period of actuarial gains and losses	4 years
Minimum | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization period of actuarial gains and losses	5 years
Maximum | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization period of actuarial gains and losses	27 years
Maximum | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization period of actuarial gains and losses	18 years