Benefit Obligations (Schedule of Net Periodic Benefit Costs Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss on pension and postretirement plans	$ 66	$ 81	$ 41
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	12	13
Interest cost	132	67	54
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(132)	(166)	(205)
Actuarial (gain) loss on pension and postretirement plans	63	91	47
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	1	0	3
Total	75	4	(88)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1
Interest cost	2	1	1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	0	0	0
Actuarial (gain) loss on pension and postretirement plans	3	(10)	(6)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	0	0	0
Total	$ 5	$ (8)	$ (4)