Employee Pension and Other Postretirement Benefits Net Benefit Costs (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure
Service cost	$ 27	$ 28
Interest cost	80	86
Expected return on plan assets	(134)	(132)
Amortization of prior service cost (credit)	4	4
Amortization of net actuarial loss (gain)	5	4
Net periodic benefit (income) cost	(18)	(10)
Other Benefits
Defined Benefit Plan Disclosure
Service cost	1	1
Interest cost	5	5
Amortization of prior service cost (credit)	(1)	(1)
Amortization of net actuarial loss (gain)	(3)	(3)
Net periodic benefit (income) cost	$ 2	$ 2