Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
U.S. Plans - Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1	$ 2	$ 2
Interest cost	4	4	7	8
Expected return on plan assets	(4)	(4)	(7)	(7)
Amortization:
Net loss	0	1	0	2
Prior service cost	2	2	4	3
Net periodic pension cost	3	4	6	8
Non-U.S. Plans - Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	50	50	100	100
Interest cost	23	33	46	64
Expected return on plan assets	(77)	(83)	(153)	(164)
Amortization:
Net loss	44	44	88	88
Prior service cost	2	1	3	2
Net periodic pension cost	$ 42	$ 45	$ 84	$ 90