EID Segment FN Segment Asset Reconciliation (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
EID [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 41,122	$ 42,649	$ 41,690
Segment Assets	36,240	36,850	36,965
Corporate Assets	4,882	5,799	4,725
Total Assets	$ 41,122	$ 42,649	$ 41,690