Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans [Member]
Defined benefit plans:
Service cost	$ 46	$ 43	$ 46
Interest cost	27	28	23
Expected return on plan assets	(40)	(38)	(33)
Amortization of prior service costs	(1)	(1)	(1)
Amortization of net loss	9	7	11
Other	4	3	2
Net periodic benefit cost	45	42	48
Other Postretirement Benefit Plan [Member]
Defined benefit plans:
Interest cost	1	1
Net periodic benefit cost	$ 0	$ 0	$ 0