Restructuring Charges (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($) work_stream restructuring_program
Restructuring Cost and Reserve
Restructuring costs incurred to date | $	$ 253
Closed Restructuring Programs
Restructuring Cost and Reserve
Number of restructuring programs | restructuring_program	3
NES/Project XL Restructuring Program
Restructuring Cost and Reserve
Number of specific work streams | work_stream	8