Employee Postretirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 11	$ 11
Interest cost	116	114	120
Expected return on plan assets	(123)	(123)	(127)
Recognized net actuarial (gain) loss	44	40	39
Settlements and curtailments	4	2	35
Other	0	0	0
Net periodic benefit cost	51	44	78
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	4
Interest cost	29	28	30
Expected return on plan assets	0	0	0
Recognized net actuarial (gain) loss	(4)	0	(3)
Settlements and curtailments	0	0	0
Other	0	0	1
Net periodic benefit cost	$ 29	$ 32	$ 32