Debt Senior Notes (Details) - USD ($) $ in Millions	Mar. 31, 2017	Jul. 01, 2016	Apr. 13, 2016
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 13,301	$ 17,526
Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,875	1,875	$ 1,875
Debt, Long-term and Short-term, Combined Amount	1,833	1,828
Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	3,350	3,350	$ 3,350
Debt, Long-term and Short-term, Combined Amount	$ 3,241	$ 3,229