10-K Retirement Benefits (Estimated Future Payments For Pension Benefits And Other Benefits) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Year One	$ 125
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	120
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	118
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	116
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	113
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	526
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Year One	32
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	30
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	29
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	28
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	27
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	$ 110