Fair Value Measurements Narrative (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Assets:
Other investments	$ 109	$ 118
Liabilities:
Derivative Assets (Liabilities), at Fair Value, Net	95	53
Level 1
Assets:
Other investments	109	118
Liabilities:
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Level 2
Assets:
Other investments	0	0
Liabilities:
Derivative Assets (Liabilities), at Fair Value, Net	95	53
Level 3
Assets:
Other investments	0	0
Liabilities:
Derivative Assets (Liabilities), at Fair Value, Net	$ 0	$ 0