Retirement Benefits Net Periodic Benefit Cost (Benefit) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Interest cost	$ 1,200
Mark-to-market pension and OPB benefit (expense)	1,232	$ 2,355	$ (1,034)
Net periodic benefit cost (benefit)	(1,193)	(1,091)	(802)
Pension Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	367	414	409
Interest cost	1,136	1,054	1,226
Expected return on plan assets	(2,641)	(2,512)	(2,376)
Amortization of prior service (credit) cost	0	(9)	(59)
Mark-to-market pension and OPB benefit (expense)	1,262	1,921	(1,034)
Other	0	(1)	10
Net periodic benefit cost (benefit)	(2,400)	(2,975)	244
Medical and Life Benefits
Components of Net Periodic Benefit Cost (Table Amounts) [Abstract]
Service cost	9	16	17
Interest cost	47	53	67
Expected return on plan assets	(110)	(105)	(102)
Amortization of prior service (credit) cost	(1)	(1)	4
Mark-to-market pension and OPB benefit (expense)	(30)	434	0
Other	0	0	2
Net periodic benefit cost (benefit)	$ (25)	$ (471)	$ (12)