Retirement Plans and Profit Sharing Arrangements (Benefit Obligation and Fair Value) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	$ 776	$ 676
Service cost	46	43	$ 46
Interest cost	27	28	23
Benefits paid	(6)	(7)
Actuarial (gain) loss	(3)	30
Settlements	(20)	(20)
Foreign currency rate changes	(8)	(8)
Additional voluntary contribution (AVC) obligation		34
Benefit obligation at end of year	812	776	676
Change in fair value of plan assets
Fair value of plan assets at the beginning of the year	612	544
Actual return on plan assets	(9)	37
Employer contributions	40	47
Benefits paid	(6)	(7)
Settlements	(20)	(20)
Foreign currency rate changes	(9)	(8)
AVC asset		19
Fair value of plan assets at the end of the year	608	612	544
Other Postretirement Benefit Plan [Member]
Change in benefit obligation
Benefit obligation at beginning of year	18	18
Interest cost	1	1
Benefits paid	(3)	(4)
Participant contributions	2	3
Benefit obligation at end of year	18	18	$ 18
Change in fair value of plan assets
Benefits paid	$ (3)	$ (4)