Postretirement Plans (Schedule Of Reconciliation Of Level 3 Assets Held) (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	$ 68,696	$ 61,711
Net Realized and Unrealized Gains/(Losses)	4,477	9,275
Net Purchases, Issuances and Settlements	(870)	(68)
Ending balance at fair value	67,813	68,696
Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	240	472
Net Realized and Unrealized Gains/(Losses)	(7)	2
Net Purchases, Issuances and Settlements	5	(71)
Net Transfers Into/(Out of) Level 3	(40)	(163)
Ending balance at fair value	198	240
US Treasury and Government [Member] | Level 3 [Member] | Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	2
Ending balance at fair value		2
Debt Securities [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	20,841
Ending balance at fair value	20,573	20,841
Debt Securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	40	5
Net Realized and Unrealized Gains/(Losses)	(1)	1
Net Purchases, Issuances and Settlements	5	18
Net Transfers Into/(Out of) Level 3	9	16
Ending balance at fair value	53	40
Debt Securities [Member] | US Treasury and Government [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	5,170
Ending balance at fair value	11,285	5,170
Debt Securities [Member] | US Treasury and Government [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	2
Net Purchases, Issuances and Settlements	(2)
Net Transfers Into/(Out of) Level 3		2
Ending balance at fair value		2
Debt Securities [Member] | Mortgage backed and asset backed securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	786
Ending balance at fair value	777	786
Debt Securities [Member] | Mortgage backed and asset backed securities [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	120	461
Net Realized and Unrealized Gains/(Losses)		(1)
Net Purchases, Issuances and Settlements	(17)	(93)
Net Transfers Into/(Out of) Level 3	(1)	(247)
Ending balance at fair value	102	120
Debt Securities [Member] | Municipal [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	1,176
Ending balance at fair value	1,064	1,176
Debt Securities [Member] | Municipal [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	72
Net Realized and Unrealized Gains/(Losses)		3
Net Purchases, Issuances and Settlements	7	2
Net Transfers Into/(Out of) Level 3	(50)	67
Ending balance at fair value	29	72
Debt Securities [Member] | Sovereign Debt Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	1,040
Ending balance at fair value	1,135	1,040
Debt Securities [Member] | Sovereign Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	2
Net Realized and Unrealized Gains/(Losses)	(8)	(1)
Net Purchases, Issuances and Settlements	15	2
Net Transfers Into/(Out of) Level 3		1
Ending balance at fair value	9	2
Equity securities [Member] | Non United States Common And Preferred Stock [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	5,577
Ending balance at fair value	3,345	5,577
Equity securities [Member] | Non United States Common And Preferred Stock [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	2	2
Net Realized and Unrealized Gains/(Losses)	2
Net Purchases, Issuances and Settlements	(3)
Net Transfers Into/(Out of) Level 3	4
Ending balance at fair value	5	2
Real estate and real assets [Member] | Real assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	786
Ending balance at fair value	784	786
Real estate and real assets [Member] | Real assets [Member] | Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance at fair value	2	4
Net Transfers Into/(Out of) Level 3	(2)	(2)
Ending balance at fair value		$ 2