Defined Benefit Postretirement Plans (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016
Pension and Other Postretirement Benefit Contributions [Abstract]
Pension Contributions		$ 14
Defined Benefit Plan, Benefits Paid		19
Other Postretirement Benefits Payments		5
Scenario, Forecast [Member]
Pension and Other Postretirement Benefit Contributions [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year				$ 48
United States and Foreign Pension Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost		6	$ 12
Interest cost		11	14
Expected return on plan assets		(15)	(19)
Amortization:
- prior service cost (credit)		(2)	1
-actuarial loss (gain)		3	7
Net settlement loss	[1]	48	17
Defined Benefit Plan, Curtailments	[2]	0	1
Net periodic benefit cost		51	33
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]
Service cost		1	1
Interest cost		3	3
Expected return on plan assets		0	0
Amortization:
- prior service cost (credit)		(1)	(1)
-actuarial loss (gain)		0	0
Net settlement loss	[1]	0	0
Defined Benefit Plan, Curtailments	[2]	0	(6)
Net periodic benefit cost		$ 3	$ (3)

[1] Settlements are recognized as they occur, once it is probable that lump sum payments from a plan for a given year will exceed the plan's total service and interest cost for that year.

[2] Related to workforce reductions, which reduced the future expected years of service for employees participating in the plans