Retirement Plans and Other Retiree Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2023	Sep. 30, 2025	Sep. 30, 2024
Components of net periodic benefit cost
ERISA litigation matter	$ 332,000,000	$ 65,000,000		$ 267,000,000	$ 65,000,000	$ 0
Other Retiree Benefits
Components of net periodic benefit cost
Service cost	2,000,000		$ 2,000,000		5,000,000	6,000,000
Interest cost	10,000,000		8,000,000		28,000,000	26,000,000
Expected return on plan assets	0		0		0	0
Amortization of actuarial losses (gains)	(5,000,000)		(5,000,000)		(12,000,000)	(13,000,000)
Net periodic benefit cost	7,000,000		5,000,000		21,000,000	19,000,000
Other postretirement charges	0		0		0	0
ERISA litigation matter					0	0
Total pension cost	7,000,000		5,000,000		21,000,000	19,000,000
United States | Pension Benefits
Components of net periodic benefit cost
Service cost	1,000,000		1,000,000		1,000,000	1,000,000
Interest cost	26,000,000		23,000,000		73,000,000	70,000,000
Expected return on plan assets	(24,000,000)		(20,000,000)		(60,000,000)	(58,000,000)
Amortization of actuarial losses (gains)	10,000,000		10,000,000		28,000,000	31,000,000
Net periodic benefit cost	13,000,000		14,000,000		42,000,000	44,000,000
Other postretirement charges	0		5,000,000		0	5,000,000
ERISA litigation matter					50,000,000	0
Total pension cost	13,000,000		19,000,000		92,000,000	49,000,000
Voluntary benefit plan contribution	12,000,000		0		23,000,000	0
International | Pension Benefits
Components of net periodic benefit cost
Service cost	4,000,000		3,000,000		13,000,000	11,000,000
Interest cost	8,000,000		7,000,000		24,000,000	22,000,000
Expected return on plan assets	(7,000,000)		(7,000,000)		(19,000,000)	(20,000,000)
Amortization of actuarial losses (gains)	3,000,000		2,000,000		4,000,000	4,000,000
Net periodic benefit cost	8,000,000		5,000,000		22,000,000	17,000,000
Other postretirement charges	0		0		0	0
ERISA litigation matter					0	0
Total pension cost	$ 8,000,000		$ 5,000,000		$ 22,000,000	$ 17,000,000