Retirement Plans and Profit Sharing Arrangements (Amounts recognized in Balance Sheet) (Details 3) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Plans [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	$ (366)	$ (278)
Benefit asset	0	5
Net amount recognized	(366)	(273)
Other Postretirement Benefits Plan [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	(14)	(14)
Benefit asset	0	0
Net amount recognized	$ (14)	$ (14)