Employee Benefit Plans - Fair Value of Plan Assets (Details) - Recurring - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Defined benefit plans:
Fair value of plan assets	$ 1,475,000,000	$ 1,351,000,000
Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	963,000,000	903,000,000
Level 1
Defined benefit plans:
Fair value of plan assets	389,000,000	364,000,000
Level 2
Defined benefit plans:
Fair value of plan assets	574,000,000	539,000,000
Level 3
Defined benefit plans:
Fair value of plan assets	0	0
Common stock | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	37,000,000	36,000,000
Common stock | Level 1
Defined benefit plans:
Fair value of plan assets	37,000,000	36,000,000
Common stock | Level 2
Defined benefit plans:
Fair value of plan assets	0	0
Common stock | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
Common collective trusts / Mutual funds | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	162,000,000	154,000,000
Common collective trusts / Mutual funds | Level 1
Defined benefit plans:
Fair value of plan assets	162,000,000	154,000,000
Common collective trusts / Mutual funds | Level 2
Defined benefit plans:
Fair value of plan assets	0	0
Common collective trusts / Mutual funds | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
Corporate bonds | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	550,000,000	517,000,000
Corporate bonds | Level 1
Defined benefit plans:
Fair value of plan assets	0	0
Corporate bonds | Level 2
Defined benefit plans:
Fair value of plan assets	550,000,000	517,000,000
Corporate bonds | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
U.S. Treasury instruments | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	152,000,000	161,000,000
U.S. Treasury instruments | Level 1
Defined benefit plans:
Fair value of plan assets	152,000,000	161,000,000
U.S. Treasury instruments | Level 2
Defined benefit plans:
Fair value of plan assets	0	0
U.S. Treasury instruments | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
U.S. government agency, state and local government bonds | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	5,000,000	4,000,000
U.S. government agency, state and local government bonds | Level 1
Defined benefit plans:
Fair value of plan assets	0	0
U.S. government agency, state and local government bonds | Level 2
Defined benefit plans:
Fair value of plan assets	5,000,000	4,000,000
U.S. government agency, state and local government bonds | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
Other | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined benefit plans:
Fair value of plan assets	57,000,000	31,000,000
Other | Level 1
Defined benefit plans:
Fair value of plan assets	38,000,000	13,000,000
Other | Level 2
Defined benefit plans:
Fair value of plan assets	19,000,000	18,000,000
Other | Level 3
Defined benefit plans:
Fair value of plan assets	0	0
U.S. equity | NAV
Defined benefit plans:
Fair value of plan assets	56,000,000	30,000,000
International equity | NAV
Defined benefit plans:
Fair value of plan assets	81,000,000	67,000,000
Fixed income | NAV
Defined benefit plans:
Fair value of plan assets	327,000,000	298,000,000
Other | NAV
Defined benefit plans:
Fair value of plan assets	$ 48,000,000	$ 53,000,000