Retirement Plans and Profit Sharing Arrangements (Other Postretirement Benefits) (Details 8) (Other Postretirement Benefit Plan [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure
Net periodic benefit cost	$ 0	$ 0	$ (1)
Benefit obligation at beginning of year	18	20
Interest cost	1	1
Benefits paid	(4)	(4)
Participant contributions	3	2
Actuarial (gain) loss		(1)
Benefit obligation at end of year	18	18	20
Recognized liabilities	$ 18	$ 18	$ 20