Retirement Plans and Profit Sharing Arrangements (Benefit Obligation and Fair Value) (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans [Member]
Change in benefit obligation
Benefit obligation at beginning of year	$ 812	$ 776
Service cost	44	46	$ 43
Interest cost	29	27	28
Benefits paid	(8)	(6)
Actuarial (gain) loss	65	(3)
Settlements	(18)	(20)
Foreign currency rate changes	(25)	(8)
Benefit obligation at end of year	899	812	776
Change in fair value of plan assets
Fair value of plan assets at the beginning of the year	608	612
Actual return on plan assets	62	(9)
Employer contributions	13	40
Benefits paid	(8)	(6)
Settlements	(18)	(20)
Foreign currency rate changes	(29)	(9)
Fair value of plan assets at the end of the year	628	608	612
Other Postretirement Benefit Plan [Member]
Change in benefit obligation
Benefit obligation at beginning of year	18	18
Interest cost	1	1
Benefits paid	(4)	(3)
Plan change	(2)
Participant contributions	2	2
Benefit obligation at end of year	15	18	$ 18
Change in fair value of plan assets
Benefits paid	$ (4)	$ (3)