Retirement Plans and Profit Sharing Arrangements (Amounts recognized in Balance Sheet) (Details 3) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension Plans [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	$ (256)	$ (253)
Benefit asset	17	6
Net amount recognized	(239)	(247)
Other Postretirement Benefits Plan [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	(14)	(15)
Benefit asset	0	0
Net amount recognized	$ (14)	$ (15)