Retirement benefits Retirement Benefits, Change in Estimate (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2016	Dec. 31, 2016
Change to Spot Yield Curve Approach to Estimate Service and Interest Costs [Abstract]
Change to spot yield curve approach, effect on pension expense	$ 8	$ 17

Change to Spot Yield Curve Approach to Estimate Service and Interest Costs [Abstract]

No definition available.

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