Employee Benefit Plans - Additional Information (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined benefit plans:
Percentage of non-matching employer's contribution to eligible participants (as a percent)	1.00%
Defined contribution plans	$ 63,000,000	$ 76,000,000	$ 73,000,000
Employer's Common stock held under 401 (k) plan (in shares)	5.0
Market value of employer's Common stock held under 401 (k) plan	$ 301,000,000
Cash dividend received on employer's common stock held under 401 (k) plan	11,000,000
Recurring
Defined benefit plans:
Plan assets	1,475,000,000	1,351,000,000
Level 3 | Recurring
Defined benefit plans:
Plan assets	0	0
Pension Benefits
Defined benefit plans:
Projected benefit obligation with projected benefit obligations	1,500,000,000	1,400,000,000
Accumulated benefit obligation with projected benefit obligations	1,400,000,000	1,400,000,000
Fair value of plan assets for pension plans with projected benefit obligations	1,100,000,000	1,000,000,000
Total retirement plan expense	30,000,000	23,000,000	17,000,000
Defined benefit plan, benefit obligation	1,756,000,000	1,673,000,000	1,765,000,000
Prior service (credit) cost	(10,000,000)
Net actuarial (gain) loss	188,000,000
Contributions and expected future benefit payments	30,000,000
Plan assets	$ 1,475,000,000	1,351,000,000	1,415,000,000
Pension Benefits | Maximum
Defined benefit plans:
Amortization period of actuarial gains and losses	27 years
Postretirement Benefits
Defined benefit plans:
Total retirement plan expense	$ 8,000,000	8,000,000	$ 8,000,000
Defined benefit plan, benefit obligation	99,000,000	$ 102,000,000
Prior service (credit) cost	1,000,000
Net actuarial (gain) loss	18,000,000
Contributions and expected future benefit payments	$ 12,000,000
Increase in annual rate	8.40%
Decrease in annual rate	4.50%
Postretirement Benefits | Minimum
Defined benefit plans:
Amortization period of actuarial gains and losses	5 years
Postretirement Benefits | Maximum
Defined benefit plans:
Amortization period of actuarial gains and losses	18 years