Retirement Benefits Net Periodic Benefit Cost (Benefit) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Interest cost	$ 1,600
Mark-to-market pension and OPB benefit (expense)	443	$ (422)	$ 1,232
Net periodic benefit cost (benefit)	(438)	(308)	(1,193)
Pension Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	239	236	367
Interest cost	1,526	1,568	1,136
Expected return on plan assets	(2,197)	(2,098)	(2,641)
Amortization of prior service credit	0	0	0
Mark-to-market pension and OPB benefit (expense)	450	(442)	1,262
Other	15	0	0
Net periodic benefit cost (benefit)	(867)	148	(2,400)
Medical and Life Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	4	5	9
Interest cost	62	67	47
Expected return on plan assets	(87)	(85)	(110)
Amortization of prior service credit	0	(1)	(1)
Mark-to-market pension and OPB benefit (expense)	(7)	20	(30)
Other	0	0	0
Net periodic benefit cost (benefit)	$ (14)	$ (34)	$ (25)