Debt (Corporate Revolving Facility and other Letters of Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified									6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Corporate Revolving Facility [Member]	Dec. 31, 2012 Corporate Revolving Facility [Member]	Dec. 31, 2013 CDH [Member]	Dec. 31, 2012 CDH [Member]	Dec. 31, 2013 Various Project Financing Facilities [Member]	Dec. 31, 2012 Various Project Financing Facilities [Member]	Jun. 30, 2013 Corporate Revolving Facility Amendment No. 1 [Member]	Jun. 30, 2013 Corporate Revolving Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum									2.25%	3.25%
Line of Credit Facility, Fair Value of Amount Outstanding	$ 630	$ 626	$ 242	$ 243	$ 218	$ 253	$ 170	$ 130
Term loan interest rate spread option Prime Rate									1.25%	2.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.50%	0.75%