Segment Information Revenue From External Customers By Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Revenue from External Customers by Geographic Area [Line Items]
Revenue	$ 37,740	$ 35,186	$ 72,953	$ 67,827
UNITED STATES
Segment Revenue from External Customers by Geographic Area [Line Items]
Revenue	36,716		70,960
Non-US [Member]
Segment Revenue from External Customers by Geographic Area [Line Items]
Revenue	1,030		2,002
Operating Segments
Segment Revenue from External Customers by Geographic Area [Line Items]
Revenue	37,746	35,190	72,962	67,834
Corporate
Segment Revenue from External Customers by Geographic Area [Line Items]
Revenue	$ (6)	$ (4)	$ (9)	$ (7)