Litigation And Other Contingencies (Schedule Of Guarantees) (Details) $ in Millions	Jun. 30, 2020 USD ($)
Litigation And Other Contingencies [Line Items]
Guarantees	$ 6,372
Equity Company Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	1,596
Other Third Party Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	4,776
Debt Related Guarantees [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	1,017
Debt Related Guarantees [Member] | Equity Company Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	904
Debt Related Guarantees [Member] | Other Third Party Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	113
Other Guarantees [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	5,355
Other Guarantees [Member] | Equity Company Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	692
Other Guarantees [Member] | Other Third Party Obligations [Member]
Litigation And Other Contingencies [Line Items]
Guarantees	$ 4,663