Retirement Plans and Profit Sharing Arrangements (Amounts recognized in Balance Sheet) (Details 3) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Pension Plans [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	$ (271)	$ (223)
Benefit asset	0	19
Net amount recognized	(271)	(204)
Other Postretirement Benefit Plan [Member]
Amounts recognized in the Consolidated Balance Sheets
Benefit liability	(15)	(18)
Benefit asset	0	0
Net amount recognized	$ (15)	$ (18)