Commitments And Contingencies (Alba Reimbursement Agreement) (Details) (Alba Reimbursement Agreement [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jan. 24, 2013
Alba Reimbursement Agreement [Member]
Reimbursement Agreement [Line Items]
Reimbursement agreement related to abandonment liabilities	$ 120
Reimbursement agreement, outstanding and accrued fees		$ 122
Reimbursement agreement related to abandonment liabilities, annual fee	13.00%