Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 3	$ 3
Interest cost	3	4	10	12
Expected return on plan assets	(3)	(3)	(10)	(10)
Amortization:
Net loss	0	0	0	2
Prior service cost	2	1	6	4
Net periodic pension cost	3	3	9	11
Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	52	51	152	151
Interest cost	23	32	69	96
Expected return on plan assets	(78)	(83)	(231)	(247)
Amortization:
Net loss	44	45	132	133
Prior service cost	1	1	4	3
Net periodic pension cost	$ 42	$ 46	$ 126	$ 136