Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined benefit plans:
Service cost	$ 44	$ 46	$ 43
Interest cost	29	27	28
Expected return on plan assets	(41)	(40)	(38)
Amortization of prior service costs	(1)	(1)	(1)
Amortization of net loss	6	9	7
Other	4	4	3
Net periodic benefit cost	$ 41	$ 45	$ 42