Defined Benefit Plans (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
U.S. pension benefits
Defined Benefit Plan Disclosure
Defined benefit plans, estimated future employer contributions in current fiscal year	$ 35
Non-U.S. pension benefits
Defined Benefit Plan Disclosure
Defined benefit plans, estimated future employer contributions in current fiscal year	$ 40