(Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 13,020	$ 11,699
Accumulated benefit obligation	12,997	11,672
Fair value of plan assets	12,018	10,165
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	245	225
Accumulated benefit obligation	227	208
Fair value of plan assets	$ 166	$ 149