Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined benefit plans:
Service cost	$ 48	$ 47	$ 44
Interest cost	30	28	29
Expected return on plan assets	(48)	(45)	(41)
Amortization of prior service costs	0	(1)	(1)
Amortization of net loss	11	10	6
Other	5	3	4
Net periodic benefit cost	$ 46	$ 42	$ 41