(Estimated Total Future Postretirement Benefit Payments, Net Of Participant Contributions And Estimated Future Medicare Part D Subsidy Receipts) (Details) - Other Postretirement Benefits Plan [Member] $ in Millions	Dec. 31, 2020 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit Payments, year 1	$ 20
Benefit Payments, year 2	18
Benefit Payments, year 3	17
Benefit Payments, year 4	16
Benefit Payments, year 5	15
Benefit Payments, year 6-10	64
Subsidy Receipts, year 1	1
Subsidy Receipts, year 2	1
Subsidy Receipts, year 3	1
Subsidy Receipts, year 4	1
Subsidy Receipts, year 5	1
Subsidy Receipts, year 6-10	4
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit Payments, year 1	0
Benefit Payments, year 2	0
Benefit Payments, year 3	1
Benefit Payments, year 4	1
Benefit Payments, year 5	1
Benefit Payments, year 6-10	$ 5