Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined benefit plans:
Service cost	$ 45	$ 44	$ 48
Interest cost	29	36	30
Expected return on plan assets	(55)	(53)	(48)
Amortization of prior service costs	(2)	0	0
Amortization of net loss	15	5	11
Other	7	8	5
Net periodic benefit cost	$ 39	$ 40	$ 46