Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined benefit plans:
Service cost	$ 44	$ 48	$ 47
Interest cost	36	30	28
Expected return on plan assets	(53)	(48)	(45)
Amortization of prior service costs	0	0	(1)
Amortization of net loss	5	11	10
Other	8	5	3
Net periodic benefit cost	$ 40	$ 46	$ 42