Retirement Plans and Profit Sharing Arrangements (Net Periodic Pension Cost) (Details 1) (Pension Plan [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plan [Member]
Defined benefit plans:
Service cost	$ 43	$ 46	$ 41
Interest cost	28	23	24
Expected return on plan assets	(38)	(33)	(30)
Amortization of prior service costs	(1)	(1)	(1)
Amortization of net loss	7	11	7
Other	3	2	4
Net periodic benefit cost	$ 42	$ 48	$ 45